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Preferred Landfill Footprint, a detailed impact assessment was carried out. ...... C9. CIRCULAR 0.6. 0. 0. 0. 1. OR1. CI
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Stoney Creek Regional Facility Environmental Assessment

Surface Water Detailed Impact Assessment Report DRAFT FOR DISCUSSION

65 Sunray Street, Whitby Ontario L1N 8Y3 Canada 11102771 | Report No 31 | June 198

Table of Contents 1.

Introduction ................................................................................................................................... 1 1.1

Background and Purpose .................................................................................................. 1

1.2

Description of the Preferred Landfill Footprint ................................................................... 2

1.3

Facility Characteristic Report ............................................................................................. 4

1.4

Surface Water Study Team................................................................................................ 4

2.

Study Area .................................................................................................................................... 4

3.

Methodology ................................................................................................................................. 6

4.

Additional Investigations .............................................................................................................. 6

5.

Detailed Description of the Environment Potentially Affected ...................................................... 6

6.

7.

5.1

Site Study Area .................................................................................................................. 6

5.2

Local Study Area ................................................................................................................ 7

Surface Water Net Effects ............................................................................................................ 9 6.1

Potential Effects on Surface Water .................................................................................... 9

6.2

Proposed Mitigation and/or Compensation Measures ..................................................... 10

6.3

Net Effects ....................................................................................................................... 13

Climate Change Considerations ................................................................................................ 13 7.1

Potential Effects of the Undertaking on Climate Change ................................................ 13 7.1.1

7.2

Effect of Climate Change on the Undertaking ................................................................. 13 7.2.1

8.

Mitigation ........................................................................................................ 13

Adaptation....................................................................................................... 13

Environmental Monitoring .......................................................................................................... 14 8.1

Monitoring Strategy and Schedule ................................................................................... 14 8.1.1 8.1.2

Environmental Effects Monitoring ................................................................... 14 Development of an Environmental Management Plan ................................... 15

9.

Commitments ............................................................................................................................. 15

10.

Other Approvals ......................................................................................................................... 15

Figure Index Figure 1.1

Preferred Landfill Footprint ................................................................................................ 3

Figure 2.1

Stoney Creek Regional Facility Site Location and Study Area ......................................... 5

Figure 5.1

Approximate SWM Measure Locations ............................................................................. 8

Figure 6.1

Existing SWM Pond Layout ............................................................................................. 11

Figure 6.2

Potential Future SWM Pond Layout ................................................................................ 12 DRAFT FOR DISCUSSION GHD | Draft Surface Water Impact Assessment Technical Report | 11102771 | i

Table Index Table 1

Peak Flow Comparison ..................................................................................................... 9

Table 2

Total Runoff Volume Comparison ..................................................................................... 9

Table 3

Potential Effects, Proposed Mitigation and Compensation Measures, and Resulting Net Effects ................................................................................................ 13

Appendices Appendix A

Existing Conditions Uncontrolled Modeling Inputs and Outputs

Appendix B

Preferred Landfill Footprint Uncontrolled Modeling Inputs and Outputs

Appendix C

Preferred Landfill Footprint Controlled Modeling (with SWM Ponds) Inputs and Outputs

Appendix D

MOECC Rough SWM Pond Sizing

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1.

Introduction This report documents the Surface Water impact assessment of the Preferred Landfill Footprint for the Environmental Assessment (EA) for landfill expansion at the Stoney Creek Regional Facility (SCRF). In the preceding Alternative Methods phase of the EA, a net effects analysis as well as a comparative evaluation of the six alternative landfill expansion options was carried out in order to identify a Preferred Landfill Footprint. The Preferred Landfill Footprint was determined to be Option #5 – Reconfiguration and Height Increase. The potential environmental effects and impact management measures to address the potential adverse environmental effects, and the remaining net effects following the application of the impact management measures were identified for the Preferred Landfill Footprint.

1.1 Background and Purpose In March of 2018, the recommended landfill expansion option (Option #5) was presented to the public, stakeholders and the Government Review Team (GRT) for comments and feedback. Following the stakeholder and agency engagement, the recommended option was confirmed and Option #5 became the ‘Preferred’ Landfill Footprint (also referred to as the Preferred Method). Following confirmation of the Preferred Landfill Footprint, a detailed impact assessment was carried out. The intent of the impact assessment is to allow for additional details to be developed on the Preferred Landfill Footprint from a design and operations perspective and to then review the impact management measures and resultant net effects described in the Alternative Methods stage within the context of the more detailed design for the Preferred Landfill Footprint. Specifically, the following can be accomplished: • • • • •

Potential environmental effects can be identified with more certainty. More site-specific impact assessment measures can be developed for application. Net environmental effects can be identified with more certainty. Appropriate monitoring requirements can be clearly defined. Specific approval/permitting requirements for the proposed undertaking can be identified.

At the completion of the impact assessment of the Preferred Landfill Footprint, the advantages and disadvantages to the environment of the Preferred Landfill Footprint were identified. Climate change mitigation and adaptation measures will also be reviewed as part of the detailed site design established for the Preferred Landfill Footprint. In addition, during the impact assessment stage of the SCRF EA, Terrapure will complete an assessment of the cumulative effects of the proposed undertaking and other non-SCRF projects/activities that are existing, planned/approved or reasonably foreseeable within the Study Area. A Facility Characteristics Report (FCR) for the SCRF has been prepared, so that potential environmental effects and mitigation or compensation measures identified for the Preferred Landfill Footprint during the Alternative Methods phase of the EA could be more accurately defined, along with enhancement opportunities and approval requirements. The discipline-specific work plans developed during the Terms of Reference outlined how impacts associated with the Preferred Landfill Footprint would be assessed. The results of these assessments have been documented in the following nine standalone Draft Detailed Impact Assessment Reports:  Transportation  Atmospheric including; 1) Air Quality and Odour  Land Use and Economic and 2) Noise,  Design and Operations  Geology and Hydrogeology  Human Health  Surface Water  Terrestrial and Aquatic DRAFT FOR DISCUSSION GHD | Draft Surface Water Impact Assessment Technical Report | 11102771 | 1

1.2 Description of the Preferred Landfill Footprint The proposed expansion of the SCRF will increase the overall size of the landfill. Vertical limits will extend higher increasing the peak height by approximately 2.5 m. Horizontal limits will extend further toward the north, back to original approved footprint of the SCRF. The area currently approved to accept industrial fill will be replaced with a base liner system to accept residual material. The proposed layout of the SCRF is presented in Figure 1.1 below. The limits of the base liner system will be expanded back to the original approved footprint of 59.1 ha. The overall Site area of 75.1 ha. will not change. The figure shows the final extent of the landfill area after the final cover has been installed (the Post-Closure phase). Minimum on-Site buffer distances of 30 m will be maintained around the perimeter of the residual material area throughout all phases. On-Site buffers currently extend to approximately 65 m in various areas along the east and south side of the Site, and up to approximately 130 m in the vicinity of the existing stormwater management facility in the northwest corner of the Site. These buffer distances will also be maintained. The proposed expansion of the SCRF will increase the approved capacity by 3,680,000 m 3, resulting in a total Site capacity of 10,000,000 1 m3 for post-diversion, solid, non-hazardous residual material. No changes are being proposed to the maximum approved fill rates of up to 750,000 tonnes of residual material in any consecutive 12 month period, or up to 8,000 tonnes per day. 0F

The SCRF will continue to accept post-diversion, solid, non-hazardous industrial residual material. The SCRF will no longer be approved to accept industrial fill material. The SCRF will continue to accept residual material from sources from within the Province of Ontario. The overall composition of the residual material is expected to remain relatively consistent as the main sources (i.e., steel making industry, soils from infrastructure development projects) will not change. Additional descriptive details on the design of the preferred alternative can be found in the detailed FCR.

1

The total Site capacity may increase to 10,180,000, pending the MOEEC approval of the current ECA Amendment Application noted in the Facility Characteristics Report. DRAFT FOR DISCUSSION GHD | Draft Surface Water Impact Assessment Technical Report | 11102771 | 2

Figure 1.1 Preferred Landfill Footprint DRAFT FOR DISCUSSION GHD | Draft Surface Water Impact Assessment Technical Report | 11102771 | 3

1.3 Facility Characteristic Report The Facility Characteristic Report (FCR) presents preliminary design and operations information for the Preferred Landfill Footprint (Option #5) and provides information on all main aspects of landfill design and operations including:     

Site layout design, including existing and proposed site characteristics; stormwater management; leachate management; landfill gas management; and, landfill development sequence and daily operations.

The FCR also provides estimates of parameters relevant to the detailed impact assessment including estimates of leachate generation, contaminant flux through the liner system, landfill gas generation, and traffic levels associated with waste and construction materials haulage.

1.4 Surface Water Study Team The Surface Water study team consisted of GHD Limited staff. The actual individuals and their specific roles are provided as follows:

• •

2.

Dilan Singaraja, P.Eng. – Senior Water Resources Engineer Melanie Schroeder, E.I.T. – Water Resources Engineering Intern

Study Area The specific Site Study Area, and Local Study Area for the Preferred Landfill Footprint at the SCRF are listed below: Site Study Area

including all the lands within the existing, approved boundaries of the SCRF, as defined by Environmental Compliance Approval (ECA) No. A181008, as amended. The Site retains an additional 18 ha for industrial fill area, as well as an additional 15 ha (approx.) of buffer zone; and;

Local Study Area including all lands within a 1.5 kilometer (km) radius of the Site Study Area boundaries. The Site Study Area includes all the perimeter swales and stormwater management (SWM) ponds that will collect and treat the stormwater runoff from the Site. The Local Study Area consists of roadside ditches, storm sewer systems, Battlefield Creek and Lower Davis Creek. Only the storm sewers under First Road West will be affected by the stormwater discharges from the Site’s SWM ponds.

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Figure 2.1 Stoney Creek Regional Facility Site Location and Study Area

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3.

Methodology The assessment of impacts associated with the Preferred Landfill Footprint was undertaken through a series of steps that were based, in part, on a number of previously prepared reports (Surface Water Existing Conditions Report and the Surface Water Comparative Evaluation Technical Memorandum). The net effects associated with the Six Alternative Landfill Footprint Options identified during the Alternative Methods phase of the EA were based on Conceptual Designs. These effects were reviewed within the context of the detailed design plans developed for the Preferred Alternative, as identified in the FCR, to determine the type and extent of any additional investigations required to ensure a comprehensive assessment of net effects. Additional investigations were then carried out, where necessary, in order to augment the previous work undertaken. With these additional investigations in mind, the potential impact on the Surface Water environment of the Preferred Landfill Footprint was documented. With a more detailed understanding of the Surface Water environment developed, the previously identified potential effects and recommended impact management measures associated with the Preferred Landfill Footprint (documented in the Alternative Methods Report, March 2018) were reviewed to ensure their accuracy in the context of the preliminary design. Based on this review, the potential effects, mitigation or compensation measures, and net effects associated with the Preferred Landfill Footprint were confirmed and documented. In addition to identifying mitigation or compensation measures, potential enhancement opportunities associated with the preliminary design for the Preferred Landfill Footprint were also identified, where possible. Following this confirmatory exercise, the requirement for monitoring in relation to net effects was identified, where appropriate. Finally, any Surface Water approvals required as part of the implementation of the Preferred Landfill Footprint were identified.

4.

Additional Investigations No additional Investigations were undertaken as the investigations completed during the existing conditions and alternative methods stages provided the information required for the impact assessment stage. Improvements to the predictive modeling was performed to provide more detail for the existing Site footprint and the Preferred Landfill Footprint through the addition of preliminary sizing of SWM measures (perimeter ditches, SWM ponds, etc.).

5.

Detailed Description of the Environment Potentially Affected 5.1 Site Study Area Clean surface runoff that is shed from the capped areas of the landfill will drain towards vegetated drainage ditches around the perimeter, where it will be conveyed by gravity to the stormwater management system in the northwest corner of the Site. The system will include culverts, sediment forebays, detention pond, drainage structures, and an outlet to the storm sewer under First Road West. The sediment forebays will assist in the removal of sediments in the runoff. The detention pond will control

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peak flows to baseline conditions and provide further quality control. The SWM ponds also serve as a point to sample the water quality prior to off-site discharge. The outlet structure can be designed with a shut-off valve so that discharges of runoff that do not meet water quality objectives can be contained within the ponds. The approximate locations of the SWM measures that will be implemented within the Site Study Area are shown of Figure 5.1. The Site Study Area also includes all water bodies and stormwater infrastructure within the Site boundaries. The main areas affected by surface water runoff from the Site include the storm sewer system that starts at a manhole on the southeast corner of First Road West and Green Mountain Road West and conveys stormwater runoff north under First Road West, eventually discharging into Lower Davis Creek.

5.2 Local Study Area The Local Study Area includes all water bodies and stormwater infrastructure within a 1.5 km radius of the Site boundaries. The main areas affected by surface water runoff from the Site include the storm sewer system under First Road West that eventually discharges into Lower Davis Creek. Battlefield Creek and the intermittent tributary of Stoney Creek are located within the Regional study area, as well as in the Vicinity study area. Lower Davis Creek crosses a limited area of the western portion of the Regional study area. The Local Study Area consist of residential, agricultural and park areas. The residential areas are located to the north, west, and south of the Site. The minor storm flows within the residential areas drain into catchbasins, which drain into the storm sewer collection system and discharge into the creeks. Major flows within the residential areas are conveyed by the roadways until discharging into either Battlefield Creek, the intermittent tributary of Stoney Creek, or Lower Davis Creek. Park and agricultural areas make up the remaining :Local Study Area, and these areas drain through overland flow. Major and minor flows from these areas are carried overland into the roadways or roadside ditches before discharging to one of the creeks.

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Source: MNRF NRVIS, 2017. Produced by GHD under licence from Ontario Ministry of Natural Resources and Forestry, © Queen's Printer 2018.

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Coordinate System: NAD 1983 UTM Zone 17N

GIS File: Q:\GIS\PROJECTS\11102000s\11102771\Layouts\005\11102771-03(005)GIS-WA006.mxd

TERRAPURE STONEY CREEK REGIONAL FACILITY EA 65 GREEN MOUNTAIN ROAD WEST, STONEY CREEK, ONTARIO

SURFACE WATER APPROXIMATE SWM MEASURE LOCATIONS

11102771-03 Jun 11, 2018

FIGURE 5.1

6.

Surface Water Net Effects As mentioned, the previously identified potential effects and recommended mitigation or compensation measures associated with the Preferred Landfill Footprint were reviewed to ensure their accuracy in the context of the preliminary design of the Preferred Alternative, based on the more detailed understanding of the Surface Water environment developed through the additional investigations. With this in mind, the confirmed potential effects, mitigation or compensation measures, and net effects are summarized in Table 3 and described in further detail in the sections below. Predictive modelling was performed using PCSWMM Version 7.1 with SWMM5 version 5.1.012 for the current approved design of the Site (baseline condition) and the Preferred Landfill Footprint. This modeling served to evaluate the changes to the peak flows and runoff volumes for Preferred Landfill Footprint when compared to the baseline condition. Modeling from the Alternative Methods Evaluation was used to demonstrate the uncontrolled flows from the Site, meaning it was assumed that there were no measures to contain and capture the runoff (i.e., perimeter ditches, stormwater management ponds, etc.). Additional modeling was performed which includes preliminary SWM measures, which means the modeling results assume controlled flows. Rough preliminary sizing was performed so that measures that contain and capture the runoff could be shown in the modeling results. This was done to show that the proposed mitigation measures are able to function at the Site. The results of the modeling of the uncontrolled peak flows and runoff volumes for each condition are summarized in the tables below. Table 1

Peak Flow Comparison Uncontrolled 2-year Storm Peak Flow (m3/s)

Options Existing/Baseline Preferred Landfill Footprint (Option #5)

Table 2

 0.969  0.969

Uncontrolled 100-year Storm

Percent Difference to Baseline  N/A  0.00%

Peak Flow (m3/s)  6.616  6.313

Percent Difference to Baseline  N/A  -4.58%

Total Runoff Volume Comparison Uncontrolled 2-year Storm

Options Existing/Baseline Preferred Landfill Footprint (Option #5)

Peak Flow (m3/s)  14,051  15,564

Uncontrolled 100-year Storm

Percent Difference to Baseline  N/A  10.77%

Peak Flow (m3/s)  57,985  61,735

Percent Difference to Baseline  N/A  6.47%

6.1 Potential Effects on Surface Water The effect on surface water quality is minimal when compared to the baseline condition, as the same material (post diversion solid, non-hazardous industrial residual material) will continue to be accepted and disposed. The Site will receive final cover with vegetation similar to the current approved design. The only contaminant of concern is Total Suspended Solids (TSS) that occurs as stormwater flows over the final cover of the SCRF. With a similar cover, there will be similar TSS levels. The overall drainage area is the same as in the baseline condition but there will be a height increase. The area will have lower permeability due the replacement of industrial fill with residual material. This will result in an increase peak flows and runoff volumes.

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During the 2-year through 100-year storm events, uncontrolled flows from the Site (assuming there are no perimeter ditches or stormwater management pond to capture runoff) will produce more runoff volume and higher peak flows than the baseline condition. The predicted increase in runoff volume is approximately 11% during the 2-year event and 6% during the 100-year event. Runoff will flow off-site and cause increased flows in the roadside ditches and creeks within the local study area. There may also be erosion or flooding in these areas during larger storm events.

6.2 Proposed Mitigation and/or Compensation Measures The existing SWM measures at the Site include perimeter ditches to the south and west, a forebay and a detention pond. The forebay and detention pond are located in the northwest corner of the Site. The ponds have been sized to provide quantity and quality control for the current Phase 1 of the landfill. The detention pond has an outlet shut-off valve that allows the outlet to be closed if the stormwater is not meeting water quality objectives. The valve can be re-opened once water quality issues have been addressed and water quality objectives are being met. The existing SWM ponds are sown on Figure 6.1. The addition of perimeter ditches that can convey up to the 100-year storm event will prevent any flows from leaving the Site. A SWM pond with two forebays can be designed to treat the runoff to the required levels and to control the release of the 2-year- through 100-year storm events to pre-development levels. This will prevent erosion and flooding off-site. The allocated SWM pond area is large enough to size a pond that can treat and control the Site runoff. There may be some complications in the design of the pond due to the elevation difference between the residual material toe of slope and the elevations of the roads adjacent to the SWM pond. The berm separating the SWM pond from Green Mountain Road West and First Road West will need to have significant design considerations. This may result in a costly design and construction of the SWM pond. Since part of the SWM pond will be built within the 30m buffer area, the berm sloping from the SWM pond to the roads will take up more than half the width of the buffer area. This means there is less area available for the SWM pond. The preliminary SWM measure sizing used in the predictive modeling shows that minor alterations to the current SWM ponds will be able to provide adequate storage for quality and quantity control. This means that the SWM pond will have enough volume to remove TSS and to contain the 2-year through 100-year storms. The minor alterations to the current SWM ponds include additional ditches along the north and west perimeter of the Site, converting the current SWM detention pond into a second forebay and re-grading the future detention pond to increase the depth and surface area of the pond. The future detention pond is currently the pond used for wheel wash and dust control water storage. For the predictive modeling the perimeter ditches were assumed to have a bottom width of 1m, depth of 1m, 3H:1V side slopes and a longitudinal slope of 0.7%. The approximate SWM pond sizing used in in the predictive modeling is shown in Figure 6.2.

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SOURCE: NEWALTA-STAGE 1 SW MANAGEMENT SYSTEM INSPECTION REPORT, JULY 2013 PROJECT NUMBER 60265424 - AECOM

TERRAPURE ENVIRONMENTAL 65 GREEN MOUNTAIN RD. W, STONEY CREEK, ONTARIO DETAILED IMPACT ASSESSMENT TERRAPURE EA - SURFACE WATER

EXISTING SWM POND LAYOUT CAD File: P:\drawings\11100000s\11102771\11102771 - REPORTS\11102771-03(022)\11102771-03(022)GN\11102771-03(022)GN-WA002.dwg

11102771-03 Jun 8, 2018

FIGURE 6.1

NEW OUTLET PIPE

NEW TOP OF POND (195.3m)

NEW FORBAY NEW PERMANENT POOL (193.0m)

NEW DETENTION POND

NEW PERIMETER DITCHES ADD PIPE

EXISTING POND BOTTOM ~190.3m WILL ALTER TO MAKE POND BOTTOM 191m

REMOVE PIPES (OR BLOCK THEM)

ADD OVERLAND FLOW WEIR

ADD PIPE

SOURCE: NEWALTA-STAGE 1 SW MANAGEMENT SYSTEM INSPECTION REPORT, JULY 2013 PROJECT NUMBER 60265424 - AECOM

TERRAPURE ENVIRONMENTAL 65 GREEN MOUNTAIN RD. W, STONEY CREEK, ONTARIO DETAILED IMPACT ASSESSMENT TERRAPURE EA - SURFACE WATER

POTENTIAL FUTURE SWM POND LAYOUT CAD File: P:\drawings\11100000s\11102771\11102771 - REPORTS\11102771-03(022)\11102771-03(022)GN\11102771-03(022)GN-WA003.dwg

11102771-03 Jun 11, 2018

FIGURE 6.2

The pond design will include emergency shut-off valves so that stormwater will not be released into the storm sewer system below First Road West, which ultimately discharges into Davis Creek, if water quality testing determines that the water quality is not suitable for discharge. Contingency measures include “status quo”, which is to discharge stormwater to the sanitary sewer for treatment at the City’s water pollution control plant.

6.3 Net Effects Based on the controlled conditions modeling (which includes preliminary SWM measures), the SWM pond and perimeter ditches will able to treat and control the runoff from the Site to the same level as the current approved design and results in low net environmental effects. Table 3

Potential Effects, Proposed Mitigation and Compensation Measures, and Resulting Net Effects

Potential Effect

Mitigation/ Compensation

Surface quality to be similar to baseline since additional residual material will have final cover. Contaminants of concern in the runoff are TSS.

The existing stormwater management pond Discharge to either surface water or to sanitary will be altered as required and described sewer with no increase in TSS and related (provide adequate permanent pool volume parameter concentrations and active storage volume) to treat TSS from the stormwater runoff.

The increased area of residual material results in an increase in impermeable area due to the residual material final cover. This will produce an increase runoff volume of 11% during the 2-year storm event and 6% during the 100-year storm event. Increased runoff volume will result in increased flooding ditches to the northwest, in the sewer below First Road West and Davis Creek. Erosion of the creek and ditches may also occur because of the increased runoff volume.

7.

Net Effect

Stormwater from the pond will not be released to surface water body (i.e., storm sewer system that drains into Davis Creek) until testing determines all parameters have been met to discharge. Contingency measures include “status quo”, which is to discharge stormwater to sanitary sewer for treatment at the City’s water pollution control plant. Perimeter ditches will keep the increased No increase in peak flows to the roadside runoff on-Site and direct flows to the modified ditches to the northwest of the Site, sewer stormwater management pond. The under First Road West and Davis Creek stormwater management pond will be sized to capture the 2-year through 100-year storm events and control the release rate to prevent flooding and erosion off-site. Contingency measures include “status quo”, which is to discharge excess stormwater to sanitary sewer for conveyance to the City’s water pollution control plant.

Climate Change Considerations 7.1 Potential Effects of the Undertaking on Climate Change 7.1.1

Mitigation

The current undertaking is not expected to have an impact on climate change from a surface water discipline perspective.

7.2 Effect of Climate Change on the Undertaking 7.2.1

Adaptation

Climate change will result in more extreme weather events. Increases in intensification and frequency of storm events is attributed to climate change and these increases are expected to occur in the future. This DRAFT FOR DISCUSSION GHD | Draft Surface Water Impact Assessment Technical Report | 11102771 | 13

means that larger rain events will happen more frequently. The current 100-year storm event is a large rain event that is expected to occur once every 100 years, meaning each year there is a 1% chance that a storm event of that magnitude will occur. With climate change, a storm with the intensity of the current 100-year event will have a higher chance of occurring each year (greater than 1%). An increase in storm event intensity and frequency may cause the SWM ponds that are designed for current day event to be undersized for a future event that has been modified by climate change. There is potential to mitigate this by ensuring that the SWM pond is sized to accommodate greater than the 100-year storm event. During detailed design, the SWM pond can be sized to have a buffer to accommodate an event greater than the 100-year storm event.

8.

Environmental Monitoring To ensure that the proposed mitigation measures identified in Section 6 are implemented as envisioned, a strategy and schedule was developed for monitoring environmental effects. With these proposed mitigation or compensation measures and monitoring requirements in mind, commitments have also been proposed for ensuring that they are carried out as part of the construction, operation, and maintenance of the landfill.

8.1 Monitoring Strategy and Schedule As mentioned, a monitoring strategy and schedule was developed based on the Surface Water Impact Assessment carried out for the Preferred Landfill Footprint to ensure that: 1) predicted net negative effects are not exceeded; 2) unexpected negative effects are addressed; and, 3) the predicted benefits are realized. 8.1.1

Environmental Effects Monitoring

The existing surface water sampling program should continue to ensure that stormwater is being treated effectively by the SWM ponds. As the Site continues to be developed, the sampling locations will need to be updated to reflect the changing surface water conditions, both on- and off-Site. Water quality parameters should be sampled to ensure that the water quality of the surface water leaving the Site is meeting quality objectives. The current monitoring program samples for many surface water parameters, such as pH, alkalinity, dissolved oxygen, temperature, conductivity, TSS, total phosphorous, chloride, total ammonia, and phenols. Sampling occurs at locations on-Site as well, and in locations in the downstream receivers. Lower Davis Creek is sampled both upstream and downstream of the discharge location to see if there is any impact that may be attributed to the Site. A similar monitoring program should be in place for the new SWM measures to ensure that there are no impacts on the surrounding surface water features. If it is sound that there are impacts from the Site or that the surface water on-Site is not meeting quality objectives. As with the current sampling program, the SWM pond outlet should be able to be shutoff in the event that water quality objectives are not being met. Annual inspections of the SWM ponds, like the inspections currently implemented, will be required to ensure that the SWM pond is operating correctly. Recording the level of sediment accumulation within the ponds will be required to ensure total suspended solids (TSS) are being effectively removed. Periodic cleaning of the ponds to remove accumulated sediments will be required to ensure that that pond continues to function as designed. The pond will also be inspected to other items that may affect the function of the pond, such as bank erosion, damage to concrete structures and quality of the pond vegetation. These issues can be addressed on an as needed basis. DRAFT FOR DISCUSSION GHD | Draft Surface Water Impact Assessment Technical Report | 11102771 | 14

8.1.2

Development of an Environmental Management Plan

An Environmental Management Plan (EMP) or Plans will be prepared following approval of the undertaking by the Minister of the Environment and prior to construction. The EMP will include a description of the proposed mitigation measures, commitments, and monitoring. This will also include a description on the standard Best Management Practices (BMP) that are currently in place at the site that will continue.

9.

Commitments Minor modifications to the current SWM ponds to account for the future alterations to the Site will require an amendment to the Environmental Compliance Approval (ECA) from the Ministry of the Environment and Climate Change (MOECC). The minor modifications to the SWM ponds include additional perimeter ditches along the north and west perimeter of the Site, converting the current SWM detention pond into a second forebay, and re-grading the future detention pond to increase the depth and surface area of the pond ECA approval will need to be obtained prior to the construction of the modified SWM ponds. An updated Emergency Response Plan for the modified SWM ponds will be required to ensure that they are functioning properly and to contain stormwater on-Site if the stormwater is not meeting water quality objectives. Stormwater will be sampled on a regular basis, as per the current monitoring implemented at the Site, and if water quality objectives are not being met, the pond outlet will be closed. When the stormwater quality issues are resolved, the value can be re-opened and stormwater discharges can resume.

10.

Other Approvals Additional approvals that may be required for the Stormwater Management of the Site include: • • •

Permit/approval from the Hamilton Conservation Authority (HCA) Permit/approval from the City of Hamilton Environmental Compliance Approval (ECA) amendment from the Ministry of the Environment and Climate Change (MOECC).

A portion of the northeast corner of the Site is located in the HCA Regulated Area. Alterations to the drainage within the regulated area to be redirected to the SWM ponds may require approvals from the HCA. The City of Hamilton will likely also need to approve of the final SWM management design. As discussed in Section 9, alternations to the SWM ponds will require an ECA amendment through the MOECC.

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Appendices

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Appendix A Existing Conditions Uncontrolled Modeling Inputs and Outputs

GHD | Draft Surface Water Impact Assessment Technical Report| 11102771

[TITLE]

[OPTIONS] ;;Options ;;-----------------FLOW_UNITS INFILTRATION FLOW_ROUTING START_DATE START_TIME REPORT_START_DATE REPORT_START_TIME END_DATE END_TIME SWEEP_START SWEEP_END DRY_DAYS REPORT_STEP WET_STEP DRY_STEP ROUTING_STEP ALLOW_PONDING INERTIAL_DAMPING VARIABLE_STEP LENGTHENING_STEP MIN_SURFAREA NORMAL_FLOW_LIMITED SKIP_STEADY_STATE FORCE_MAIN_EQUATION LINK_OFFSETS MIN_SLOPE MAX_TRIALS HEAD_TOLERANCE SYS_FLOW_TOL LAT_FLOW_TOL MINIMUM_STEP THREADS

Value -----------CMS CURVE_NUMBER DYNWAVE 01/29/2018 00:00:00 01/29/2018 00:00:00 02/03/2018 00:00:00 01/01 12/31 0 00:01:00 00:05:00 00:05:00 5 NO PARTIAL 0.75 0 0 BOTH NO H-W DEPTH 0 8 0.0015 5 5 0.5 2

[EVAPORATION] ;;Type Parameters ;;------------- ---------CONSTANT 0.0 DRY_ONLY NO [RAINGAGES] ;; ;;Name ;;---------------100yr_Chicago_24hr 2yr_Chicago_24hr

Rain Type --------INTENSITY INTENSITY

Time Intrvl -----0:05 0:05

Snow Catch -----1.0 1.0

Data Source ---------TIMESERIES 100yr_Chicago_24hr TIMESERIES 2yr_Chicago_24hr

[SUBCATCHMENTS] ;; ;;Name ;;-------------S1 S2 S3 S4 S5 S6 S7

Raingage Outlet ---------------- ---------------100yr_Chicago_24hr OF1 100yr_Chicago_24hr OF1 100yr_Chicago_24hr OF1 100yr_Chicago_24hr OF1 100yr_Chicago_24hr OF1 100yr_Chicago_24hr OF1 100yr_Chicago_24hr OF1

[SUBAREAS] ;;Subcatchment ;;-------------S1 S2 S3 S4 S5 S6 S7

N-Imperv ---------0.011 0.011 0.011 0.011 0.011 0.011 0.011

N-Perv ---------0.24 0.24 0.24 0.24 0.24 0.24 0.24

S-Imperv ---------2 2 2 2 2 2 2

[INFILTRATION] ;;Subcatchment ;;-------------S1 S2 S3 S4 S5 S6 S7

CurveNum ---------74 74 74 68 68 84 84

HydCon ---------0.5 0.5 0.5 0.5 0.5 0.5 0.5

DryTime ---------7 7 7 7 7 7 7

Total Area -------2.4655 7.0542 7.9144 5.5882 9.5994 26.2669 14.9145

Pcnt. Imperv -------25 5 5 5 5 5 5

S-Perv ---------5 5 5 5 5 5 5

Width -------493.1 587.85 659.533 223.528 436.336 691.234 596.58

PctZero ---------0 0 0 0 0 0 0

Pcnt. Slope -------0.5 0.5 0.5 6 6 5 5

Curb Snow Length Pack -------- -------0 0 0 0 0 0 0

RouteTo PctRouted ---------- ---------OUTLET OUTLET OUTLET OUTLET OUTLET OUTLET OUTLET

[OUTFALLS] ;; ;;Name ;;-------------OF1

Invert Elev. ---------190.2

Outfall Stage/Table Type Time Series ------------ ---------------NORMAL

Tide Gate Route To ---- ---------------NO

[TIMESERIES] ;;Name Date Time Value ;;-------------- ---------- ---------- ---------;Chicago design storm, a = 2317.4, b = 11, c = 0.836, Duration = 1440 minutes, r = 0.35, rain units = mm/hr. 100yr_Chicago_24hr 0:00 0.902 100yr_Chicago_24hr 0:05 0.91 100yr_Chicago_24hr 0:10 0.918 100yr_Chicago_24hr 0:15 0.926 100yr_Chicago_24hr 0:20 0.934 100yr_Chicago_24hr 0:25 0.943 100yr_Chicago_24hr 0:30 0.951 100yr_Chicago_24hr 0:35 0.96 100yr_Chicago_24hr 0:40 0.969 100yr_Chicago_24hr 0:45 0.978 100yr_Chicago_24hr 0:50 0.988 100yr_Chicago_24hr 0:55 0.997 100yr_Chicago_24hr 1:00 1.007 100yr_Chicago_24hr 1:05 1.017 100yr_Chicago_24hr 1:10 1.027 100yr_Chicago_24hr 1:15 1.038 100yr_Chicago_24hr 1:20 1.049 100yr_Chicago_24hr 1:25 1.06 100yr_Chicago_24hr 1:30 1.071 100yr_Chicago_24hr 1:35 1.082 100yr_Chicago_24hr 1:40 1.094 100yr_Chicago_24hr 1:45 1.106 100yr_Chicago_24hr 1:50 1.119 100yr_Chicago_24hr 1:55 1.131 100yr_Chicago_24hr 2:00 1.144 100yr_Chicago_24hr 2:05 1.157 100yr_Chicago_24hr 2:10 1.171 100yr_Chicago_24hr 2:15 1.185 100yr_Chicago_24hr 2:20 1.199 100yr_Chicago_24hr 2:25 1.214 100yr_Chicago_24hr 2:30 1.229 100yr_Chicago_24hr 2:35 1.245 100yr_Chicago_24hr 2:40 1.261 100yr_Chicago_24hr 2:45 1.277 100yr_Chicago_24hr 2:50 1.294 100yr_Chicago_24hr 2:55 1.312 100yr_Chicago_24hr 3:00 1.33 100yr_Chicago_24hr 3:05 1.348 100yr_Chicago_24hr 3:10 1.367 100yr_Chicago_24hr 3:15 1.387 100yr_Chicago_24hr 3:20 1.408 100yr_Chicago_24hr 3:25 1.429 100yr_Chicago_24hr 3:30 1.45 100yr_Chicago_24hr 3:35 1.473 100yr_Chicago_24hr 3:40 1.496 100yr_Chicago_24hr 3:45 1.52 100yr_Chicago_24hr 3:50 1.545 100yr_Chicago_24hr 3:55 1.571 100yr_Chicago_24hr 4:00 1.597 100yr_Chicago_24hr 4:05 1.625 100yr_Chicago_24hr 4:10 1.654 100yr_Chicago_24hr 4:15 1.684 100yr_Chicago_24hr 4:20 1.715 100yr_Chicago_24hr 4:25 1.747 100yr_Chicago_24hr 4:30 1.781 100yr_Chicago_24hr 4:35 1.817 100yr_Chicago_24hr 4:40 1.853 100yr_Chicago_24hr 4:45 1.892 100yr_Chicago_24hr 4:50 1.932 100yr_Chicago_24hr 4:55 1.975 100yr_Chicago_24hr 5:00 2.019 100yr_Chicago_24hr 5:05 2.065 100yr_Chicago_24hr 5:10 2.114 100yr_Chicago_24hr 5:15 2.166 100yr_Chicago_24hr 5:20 2.22 100yr_Chicago_24hr 5:25 2.278 100yr_Chicago_24hr 5:30 2.338 100yr_Chicago_24hr 5:35 2.403 100yr_Chicago_24hr 5:40 2.471 100yr_Chicago_24hr 5:45 2.543 100yr_Chicago_24hr 5:50 2.621 100yr_Chicago_24hr 5:55 2.704 100yr_Chicago_24hr 6:00 2.792 100yr_Chicago_24hr 6:05 2.887

100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr

6:10 6:15 6:20 6:25 6:30 6:35 6:40 6:45 6:50 6:55 7:00 7:05 7:10 7:15 7:20 7:25 7:30 7:35 7:40 7:45 7:50 7:55 8:00 8:05 8:10 8:15 8:20 8:25 8:30 8:35 8:40 8:45 8:50 8:55 9:00 9:05 9:10 9:15 9:20 9:25 9:30 9:35 9:40 9:45 9:50 9:55 10:00 10:05 10:10 10:15 10:20 10:25 10:30 10:35 10:40 10:45 10:50 10:55 11:00 11:05 11:10 11:15 11:20 11:25 11:30 11:35 11:40 11:45 11:50 11:55 12:00 12:05 12:10 12:15 12:20 12:25 12:30 12:35 12:40 12:45 12:50 12:55 13:00 13:05 13:10

2.99 3.1 3.22 3.35 3.493 3.648 3.82 4.009 4.221 4.457 4.723 5.026 5.372 5.774 6.244 6.802 7.475 8.303 9.344 10.693 12.504 15.055 18.888 25.214 37.305 67.486 193.627 169.127 90.119 58.886 42.853 33.325 27.101 22.758 19.576 17.155 15.256 13.732 12.483 11.442 10.562 9.81 9.158 8.59 8.09 7.646 7.249 6.894 6.572 6.281 6.015 5.772 5.548 5.342 5.152 4.975 4.811 4.658 4.514 4.38 4.254 4.136 4.024 3.919 3.819 3.725 3.635 3.55 3.469 3.392 3.319 3.249 3.182 3.118 3.057 2.998 2.941 2.887 2.835 2.785 2.737 2.69 2.646 2.602 2.561

100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr

13:15 13:20 13:25 13:30 13:35 13:40 13:45 13:50 13:55 14:00 14:05 14:10 14:15 14:20 14:25 14:30 14:35 14:40 14:45 14:50 14:55 15:00 15:05 15:10 15:15 15:20 15:25 15:30 15:35 15:40 15:45 15:50 15:55 16:00 16:05 16:10 16:15 16:20 16:25 16:30 16:35 16:40 16:45 16:50 16:55 17:00 17:05 17:10 17:15 17:20 17:25 17:30 17:35 17:40 17:45 17:50 17:55 18:00 18:05 18:10 18:15 18:20 18:25 18:30 18:35 18:40 18:45 18:50 18:55 19:00 19:05 19:10 19:15 19:20 19:25 19:30 19:35 19:40 19:45 19:50 19:55 20:00 20:05 20:10 20:15

2.52 2.482 2.444 2.408 2.372 2.338 2.305 2.273 2.242 2.211 2.182 2.154 2.126 2.099 2.073 2.047 2.022 1.998 1.974 1.951 1.929 1.907 1.886 1.865 1.845 1.825 1.806 1.787 1.768 1.75 1.732 1.715 1.698 1.681 1.665 1.649 1.634 1.618 1.604 1.589 1.575 1.56 1.547 1.533 1.52 1.507 1.494 1.481 1.469 1.457 1.445 1.433 1.422 1.411 1.4 1.389 1.378 1.367 1.357 1.347 1.337 1.327 1.317 1.308 1.298 1.289 1.28 1.271 1.262 1.254 1.245 1.237 1.228 1.22 1.212 1.204 1.196 1.188 1.181 1.173 1.166 1.158 1.151 1.144 1.137

100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr

20:20 20:25 20:30 20:35 20:40 20:45 20:50 20:55 21:00 21:05 21:10 21:15 21:20 21:25 21:30 21:35 21:40 21:45 21:50 21:55 22:00 22:05 22:10 22:15 22:20 22:25 22:30 22:35 22:40 22:45 22:50 22:55 23:00 23:05 23:10 23:15 23:20 23:25 23:30 23:35 23:40 23:45 23:50 23:55 24:00

1.13 1.123 1.117 1.11 1.103 1.097 1.09 1.084 1.078 1.072 1.066 1.06 1.054 1.048 1.042 1.036 1.031 1.025 1.02 1.014 1.009 1.003 0.998 0.993 0.988 0.983 0.978 0.973 0.968 0.963 0.958 0.953 0.949 0.944 0.939 0.935 0.93 0.926 0.921 0.917 0.913 0.908 0.904 0.9 0

;Chicago design storm, a = 646, b = 6, c = 0.781, Duration = 1440 minutes, r = 0.35, rain units = mm/hr. 2yr_Chicago_24hr 0:00 0.491 2yr_Chicago_24hr 0:05 0.494 2yr_Chicago_24hr 0:10 0.498 2yr_Chicago_24hr 0:15 0.502 2yr_Chicago_24hr 0:20 0.507 2yr_Chicago_24hr 0:25 0.511 2yr_Chicago_24hr 0:30 0.515 2yr_Chicago_24hr 0:35 0.52 2yr_Chicago_24hr 0:40 0.524 2yr_Chicago_24hr 0:45 0.529 2yr_Chicago_24hr 0:50 0.533 2yr_Chicago_24hr 0:55 0.538 2yr_Chicago_24hr 1:00 0.543 2yr_Chicago_24hr 1:05 0.548 2yr_Chicago_24hr 1:10 0.553 2yr_Chicago_24hr 1:15 0.558 2yr_Chicago_24hr 1:20 0.563 2yr_Chicago_24hr 1:25 0.568 2yr_Chicago_24hr 1:30 0.574 2yr_Chicago_24hr 1:35 0.58 2yr_Chicago_24hr 1:40 0.585 2yr_Chicago_24hr 1:45 0.591 2yr_Chicago_24hr 1:50 0.597 2yr_Chicago_24hr 1:55 0.603 2yr_Chicago_24hr 2:00 0.61 2yr_Chicago_24hr 2:05 0.616 2yr_Chicago_24hr 2:10 0.623 2yr_Chicago_24hr 2:15 0.629 2yr_Chicago_24hr 2:20 0.636 2yr_Chicago_24hr 2:25 0.643 2yr_Chicago_24hr 2:30 0.651 2yr_Chicago_24hr 2:35 0.658 2yr_Chicago_24hr 2:40 0.666 2yr_Chicago_24hr 2:45 0.674 2yr_Chicago_24hr 2:50 0.682 2yr_Chicago_24hr 2:55 0.69 2yr_Chicago_24hr 3:00 0.699 2yr_Chicago_24hr 3:05 0.707

2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr

3:10 3:15 3:20 3:25 3:30 3:35 3:40 3:45 3:50 3:55 4:00 4:05 4:10 4:15 4:20 4:25 4:30 4:35 4:40 4:45 4:50 4:55 5:00 5:05 5:10 5:15 5:20 5:25 5:30 5:35 5:40 5:45 5:50 5:55 6:00 6:05 6:10 6:15 6:20 6:25 6:30 6:35 6:40 6:45 6:50 6:55 7:00 7:05 7:10 7:15 7:20 7:25 7:30 7:35 7:40 7:45 7:50 7:55 8:00 8:05 8:10 8:15 8:20 8:25 8:30 8:35 8:40 8:45 8:50 8:55 9:00 9:05 9:10 9:15 9:20 9:25 9:30 9:35 9:40 9:45 9:50 9:55 10:00 10:05 10:10

0.716 0.726 0.735 0.745 0.755 0.766 0.777 0.788 0.8 0.812 0.824 0.837 0.85 0.864 0.879 0.893 0.909 0.925 0.942 0.959 0.978 0.997 1.017 1.037 1.059 1.082 1.106 1.132 1.158 1.187 1.216 1.248 1.282 1.317 1.355 1.396 1.439 1.486 1.536 1.59 1.649 1.713 1.782 1.859 1.943 2.037 2.142 2.259 2.392 2.544 2.72 2.926 3.171 3.467 3.832 4.296 4.906 5.746 6.98 8.979 12.777 22.718 82.124 65.733 30.699 19.738 14.53 11.522 9.572 8.208 7.201 6.426 5.812 5.313 4.899 4.55 4.252 3.994 3.768 3.569 3.391 3.233 3.09 2.96 2.842

2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr

10:15 10:20 10:25 10:30 10:35 10:40 10:45 10:50 10:55 11:00 11:05 11:10 11:15 11:20 11:25 11:30 11:35 11:40 11:45 11:50 11:55 12:00 12:05 12:10 12:15 12:20 12:25 12:30 12:35 12:40 12:45 12:50 12:55 13:00 13:05 13:10 13:15 13:20 13:25 13:30 13:35 13:40 13:45 13:50 13:55 14:00 14:05 14:10 14:15 14:20 14:25 14:30 14:35 14:40 14:45 14:50 14:55 15:00 15:05 15:10 15:15 15:20 15:25 15:30 15:35 15:40 15:45 15:50 15:55 16:00 16:05 16:10 16:15 16:20 16:25 16:30 16:35 16:40 16:45 16:50 16:55 17:00 17:05 17:10 17:15

2.734 2.635 2.544 2.459 2.381 2.308 2.24 2.176 2.116 2.06 2.007 1.957 1.91 1.865 1.822 1.782 1.744 1.707 1.672 1.639 1.607 1.577 1.548 1.52 1.493 1.467 1.442 1.419 1.396 1.373 1.352 1.331 1.311 1.292 1.274 1.256 1.238 1.221 1.205 1.189 1.173 1.158 1.144 1.13 1.116 1.103 1.09 1.077 1.064 1.052 1.041 1.029 1.018 1.007 0.997 0.986 0.976 0.966 0.957 0.947 0.938 0.929 0.92 0.911 0.903 0.895 0.886 0.879 0.871 0.863 0.856 0.848 0.841 0.834 0.827 0.82 0.814 0.807 0.801 0.794 0.788 0.782 0.776 0.77 0.764

2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr [REPORT] INPUT CONTROLS

YES NO

17:20 17:25 17:30 17:35 17:40 17:45 17:50 17:55 18:00 18:05 18:10 18:15 18:20 18:25 18:30 18:35 18:40 18:45 18:50 18:55 19:00 19:05 19:10 19:15 19:20 19:25 19:30 19:35 19:40 19:45 19:50 19:55 20:00 20:05 20:10 20:15 20:20 20:25 20:30 20:35 20:40 20:45 20:50 20:55 21:00 21:05 21:10 21:15 21:20 21:25 21:30 21:35 21:40 21:45 21:50 21:55 22:00 22:05 22:10 22:15 22:20 22:25 22:30 22:35 22:40 22:45 22:50 22:55 23:00 23:05 23:10 23:15 23:20 23:25 23:30 23:35 23:40 23:45 23:50 23:55 24:00

0.759 0.753 0.748 0.742 0.737 0.732 0.726 0.721 0.716 0.712 0.707 0.702 0.697 0.693 0.688 0.684 0.679 0.675 0.671 0.666 0.662 0.658 0.654 0.65 0.646 0.642 0.638 0.635 0.631 0.627 0.624 0.62 0.616 0.613 0.61 0.606 0.603 0.599 0.596 0.593 0.59 0.587 0.583 0.58 0.577 0.574 0.571 0.568 0.566 0.563 0.56 0.557 0.554 0.551 0.549 0.546 0.543 0.541 0.538 0.536 0.533 0.531 0.528 0.526 0.523 0.521 0.518 0.516 0.514 0.511 0.509 0.507 0.505 0.502 0.5 0.498 0.496 0.494 0.492 0.49 0

SUBCATCHMENTS ALL NODES ALL LINKS ALL [TAGS] [MAP] DIMENSIONS UNITS

26987513.1116968 -18049644.7479964 26991668.5723983 -18044962.7536909 Feet

[COORDINATES] ;;Node X-Coord Y-Coord ;;-------------- ---------------- ---------------OF1 26987680.786 -18045155.629 [VERTICES] ;;Link X-Coord Y-Coord ;;-------------- ---------------- ---------------[POLYGONS] ;;Subcatchment ;;-------------S1 S1 S1 S1 S1 S2 S2 S2 S2 S2 S2 S2 S2 S2 S2 S2 S2 S2 S2 S2 S2 S2 S2 S2 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S4 S4 S4 S4 S4 S4 S4 S4 S4

X-Coord ---------------26987719.594 26987717.401 26987701.996 26988990.929 26987719.594 26990856.544 26990890.871 26991043.567 26991045.775 26988708.889 26988683.905 26987765.564 26987717.401 26987719.594 26988373.3 26988464.687 26987908.201 26987910.21 26987858.442 26987891.863 26988721.115 26988816.075 26988831.899 26990856.544 26989020.579 26988461.035 26988373.3 26988990.929 26991185.95 26991193.064 26991466.742 26991479.688 26991226.378 26991226.576 26991472.755 26991478.621 26991107.556 26991109.777 26991065.702 26991061.648 26991045.775 26991043.567 26990890.025 26990979.189 26990977.036 26991155.765 26991148.234 26991090.24 26991085.735 26991160.867 26991127.167 26991051.755 26991050.761 26989020.579 26988468.539 26989210.65 26988652.375 26987866.042 26987865.705 26987865.522 26987858.442 26987910.21 26987908.201

Y-Coord ----------------18045945.345 -18045946.144 -18045213.232 -18045199.299 -18045945.345 -18049089.716 -18049055.824 -18049396.486 -18049399.734 -18049431.93 -18048227.267 -18048237.555 -18045946.144 -18045945.345 -18045561.736 -18045666.201 -18045996.264 -18046396.727 -18046511.339 -18048104.225 -18048093.979 -18048157.488 -18049128.676 -18049089.716 -18045349.997 -18045662.026 -18045561.736 -18045199.299 -18045175.572 -18045449.141 -18045447.535 -18046880.147 -18046890.544 -18047281.831 -18047282.593 -18048539.046 -18048540.69 -18049227.733 -18049228.583 -18049399.515 -18049399.734 -18049396.486 -18049053.937 -18048968.044 -18048414.159 -18048402.192 -18047422.332 -18047360.958 -18046832.706 -18046751.723 -18045593.462 -18045512.545 -18045313.735 -18045349.997 -18045657.841 -18046441.433 -18046839.383 -18046873.566 -18046857.472 -18046848.775 -18046511.339 -18046396.727 -18045996.264

S4 S4 S4 S4 S5 S5 S5 S5 S5 S5 S5 S5 S5 S5 S5 S5 S5 S5 S5 S6 S6 S6 S6 S6 S6 S6 S6 S6 S6 S6 S6 S6 S6 S6 S6 S7 S7 S7 S7 S7 S7 S7 S7 S7 S7 S7 S7 S7 S7 S7 S7 S7 S7 S7 S7 S7 S7 S7 S7

26988464.687 26988461.035 26988462.068 26988468.539 26989210.65 26988468.539 26989020.579 26991050.761 26991051.755 26991127.167 26991140.484 26991140.528 26990883.496 26990697.365 26990134.515 26989935.282 26989565.323 26989463.886 26989210.65 26990334.966 26990889.778 26990885.057 26990871.666 26990856.544 26988831.899 26988816.075 26988721.115 26987891.863 26987866.042 26988652.375 26989224.508 26990118.912 26990157.986 26990244.516 26990334.966 26990118.912 26989224.508 26989463.886 26989565.323 26989935.282 26990134.515 26990697.365 26990883.496 26991140.528 26991140.773 26991160.867 26991085.735 26991090.24 26991148.234 26991155.765 26990977.036 26990979.189 26990890.025 26990890.871 26990889.778 26990334.966 26990244.516 26990157.986 26990118.912

-18045666.201 -18045662.026 -18045661.45 -18045657.841 -18046441.433 -18045657.841 -18045349.997 -18045313.735 -18045512.545 -18045593.462 -18046051.15 -18046052.679 -18046065.804 -18045955.739 -18045955.76 -18046008.305 -18046188.612 -18046260.921 -18046441.433 -18047730.986 -18049056.902 -18049061.564 -18049074.786 -18049089.716 -18049128.676 -18048157.488 -18048093.979 -18048104.225 -18046873.566 -18046839.383 -18046431.554 -18047128.983 -18047159.501 -18047655.754 -18047730.986 -18047128.983 -18046431.554 -18046260.921 -18046188.612 -18046008.305 -18045955.76 -18045955.739 -18046065.804 -18046052.679 -18046061.11 -18046751.723 -18046832.706 -18047360.958 -18047422.332 -18048402.192 -18048414.159 -18048968.044 -18049053.937 -18049055.824 -18049056.902 -18047730.986 -18047655.754 -18047159.501 -18047128.983

[SYMBOLS] ;;Gage X-Coord Y-Coord ;;-------------- ---------------- ----------------

EPA STORM WATER MANAGEMENT MODEL - VERSION 5.1 (Build 5.1.012) --------------------------------------------------------------

************* Element Count ************* Number of rain gages ...... Number of subcatchments ... Number of nodes ........... Number of links ........... Number of pollutants ...... Number of land uses .......

2 7 1 0 0 0

**************** Raingage Summary **************** Data Recording Name Data Source Type Interval -----------------------------------------------------------------------100yr_Chicago_24hr 100yr_Chicago_24hr INTENSITY 5 min. 2yr_Chicago_24hr 2yr_Chicago_24hr INTENSITY 5 min.

******************** Subcatchment Summary ******************** Name Area Width %Imperv %Slope Rain Gage Outlet ----------------------------------------------------------------------------------------------------------S1 2.47 493.10 25.00 0.5000 100yr_Chicago_24hr OF1 S2 7.05 587.85 5.00 0.5000 100yr_Chicago_24hr OF1 S3 7.91 659.53 5.00 0.5000 100yr_Chicago_24hr OF1 S4 5.59 223.53 5.00 6.0000 100yr_Chicago_24hr OF1 S5 9.60 436.34 5.00 6.0000 100yr_Chicago_24hr OF1 S6 26.27 691.23 5.00 5.0000 100yr_Chicago_24hr OF1 S7 14.91 596.58 5.00 5.0000 100yr_Chicago_24hr OF1

************ Node Summary ************ Invert Max. Ponded External Name Type Elev. Depth Area Inflow ------------------------------------------------------------------------------OF1 OUTFALL 190.20 0.00 0.0

********************************************************* NOTE: The summary statistics displayed in this report are based on results found at every computational time step, not just on results from each reporting time step. ********************************************************* **************** Analysis Options **************** Flow Units ............... Process Models: Rainfall/Runoff ........ RDII ................... Snowmelt ............... Groundwater ............ Flow Routing ........... Water Quality .......... Infiltration Method ...... Starting Date ............ Ending Date .............. Antecedent Dry Days ...... Report Time Step ......... Wet Time Step ............ Dry Time Step ............

************************** Runoff Quantity Continuity ************************** Total Precipitation ...... Evaporation Loss ......... Infiltration Loss ........ Surface Runoff ........... Final Storage ............ Continuity Error (%) .....

CMS YES NO NO NO NO NO CURVE_NUMBER 01/29/2018 00:00:00 02/03/2018 00:00:00 0.0 00:01:00 00:05:00 00:05:00

Volume hectare-m --------9.335 0.000 3.446 5.798 0.096 -0.059

Depth mm ------126.491 0.000 46.693 78.567 1.306

************************** Flow Routing Continuity ************************** Dry Weather Inflow ....... Wet Weather Inflow ....... Groundwater Inflow ....... RDII Inflow .............. External Inflow .......... External Outflow ......... Flooding Loss ............ Evaporation Loss ......... Exfiltration Loss ........ Initial Stored Volume .... Final Stored Volume ...... Continuity Error (%) .....

Volume hectare-m --------0.000 5.798 0.000 0.000 0.000 5.798 0.000 0.000 0.000 0.000 0.000 0.000

Volume 10^6 ltr --------0.000 57.986 0.000 0.000 0.000 57.986 0.000 0.000 0.000 0.000 0.000

*************************** Subcatchment Runoff Summary *************************** -------------------------------------------------------------------------------------------------------Total Total Total Total Total Total Peak Runoff Precip Runon Evap Infil Runoff Runoff Runoff Coeff Subcatchment mm mm mm mm mm 10^6 ltr CMS -------------------------------------------------------------------------------------------------------S1 126.49 0.00 0.00 42.69 82.47 2.03 0.47 0.652 S2 126.49 0.00 0.00 54.89 70.35 4.96 0.45 0.556 S3 126.49 0.00 0.00 54.89 70.35 5.57 0.50 0.556 S4 126.49 0.00 0.00 63.26 62.00 3.46 0.38 0.490 S5 126.49 0.00 0.00 63.16 62.11 5.96 0.70 0.491 S6 126.49 0.00 0.00 37.96 87.30 22.93 2.48 0.690 S7 126.49 0.00 0.00 37.70 87.59 13.06 1.82 0.692

Analysis begun on: Thu Jun 07 17:48:59 2018 Analysis ended on: Thu Jun 07 17:49:00 2018 Total elapsed time: 00:00:01

Appendix B Preferred Landfill Footprint Uncontrolled Modeling Inputs and Outputs

GHD | Draft Surface Water Impact Assessment Technical Report| 11102771

[TITLE]

[OPTIONS] ;;Options ;;-----------------FLOW_UNITS INFILTRATION FLOW_ROUTING START_DATE START_TIME REPORT_START_DATE REPORT_START_TIME END_DATE END_TIME SWEEP_START SWEEP_END DRY_DAYS REPORT_STEP WET_STEP DRY_STEP ROUTING_STEP ALLOW_PONDING INERTIAL_DAMPING VARIABLE_STEP LENGTHENING_STEP MIN_SURFAREA NORMAL_FLOW_LIMITED SKIP_STEADY_STATE FORCE_MAIN_EQUATION LINK_OFFSETS MIN_SLOPE MAX_TRIALS HEAD_TOLERANCE SYS_FLOW_TOL LAT_FLOW_TOL MINIMUM_STEP THREADS

Value -----------CMS CURVE_NUMBER DYNWAVE 01/29/2018 00:00:00 01/29/2018 00:00:00 02/03/2018 00:00:00 01/01 12/31 0 00:01:00 00:05:00 00:05:00 5 NO PARTIAL 0.75 0 0 BOTH NO H-W DEPTH 0 8 0.0015 5 5 0.5 2

[EVAPORATION] ;;Type Parameters ;;------------- ---------CONSTANT 0.0 DRY_ONLY NO [RAINGAGES] ;; ;;Name ;;---------------100yr_Chicago_24hr 2yr_Chicago_24hr

Rain Type --------INTENSITY INTENSITY

Time Intrvl -----0:05 0:05

Snow Catch -----1.0 1.0

Data Source ---------TIMESERIES 100yr_Chicago_24hr TIMESERIES 2yr_Chicago_24hr

[SUBCATCHMENTS] ;; ;;Name ;;-------------S1 S2 S3 S4 S5

Raingage Outlet ---------------- ---------------100yr_Chicago_24hr OF1 100yr_Chicago_24hr OF1 100yr_Chicago_24hr OF1 100yr_Chicago_24hr OF1 100yr_Chicago_24hr OF1

[SUBAREAS] ;;Subcatchment ;;-------------S1 S2 S3 S4 S5

N-Imperv ---------0.011 0.011 0.011 0.011 0.011

N-Perv ---------0.24 0.24 0.24 0.24 0.24

S-Imperv ---------2 2 2 2 2

[INFILTRATION] ;;Subcatchment ;;-------------S1 S2 S3 S4 S5

CurveNum ---------74 74 74 84 84

HydCon ---------0.5 0.5 0.5 0.5 0.5

DryTime ---------7 7 7 7 7

[OUTFALLS] ;; ;;Name ;;-------------OF1

Invert Elev. ---------190.2

Outfall Stage/Table Type Time Series ------------ ---------------NORMAL

Total Area -------2.4655 7.0542 7.9144 27.6099 28.759

Pcnt. Imperv -------25 5 5 5 5

S-Perv ---------5 5 5 5 5

Width -------493.1 587.85 659.533 600.215 777.27

PctZero ---------0 0 0 0 0

Pcnt. Slope -------0.5 0.5 0.5 5 5

Curb Snow Length Pack -------- -------0 0 0 0 0

RouteTo PctRouted ---------- ---------OUTLET OUTLET OUTLET OUTLET OUTLET

Tide Gate Route To ---- ---------------NO

[TIMESERIES] ;;Name Date Time Value ;;-------------- ---------- ---------- ---------;Chicago design storm, a = 2317.4, b = 11, c = 0.836, Duration = 1440 minutes, r = 0.35, rain units = mm/hr. 100yr_Chicago_24hr 0:00 0.902 100yr_Chicago_24hr 0:05 0.91 100yr_Chicago_24hr 0:10 0.918 100yr_Chicago_24hr 0:15 0.926 100yr_Chicago_24hr 0:20 0.934 100yr_Chicago_24hr 0:25 0.943 100yr_Chicago_24hr 0:30 0.951 100yr_Chicago_24hr 0:35 0.96 100yr_Chicago_24hr 0:40 0.969 100yr_Chicago_24hr 0:45 0.978 100yr_Chicago_24hr 0:50 0.988 100yr_Chicago_24hr 0:55 0.997 100yr_Chicago_24hr 1:00 1.007 100yr_Chicago_24hr 1:05 1.017 100yr_Chicago_24hr 1:10 1.027 100yr_Chicago_24hr 1:15 1.038 100yr_Chicago_24hr 1:20 1.049 100yr_Chicago_24hr 1:25 1.06 100yr_Chicago_24hr 1:30 1.071 100yr_Chicago_24hr 1:35 1.082 100yr_Chicago_24hr 1:40 1.094 100yr_Chicago_24hr 1:45 1.106 100yr_Chicago_24hr 1:50 1.119 100yr_Chicago_24hr 1:55 1.131 100yr_Chicago_24hr 2:00 1.144 100yr_Chicago_24hr 2:05 1.157 100yr_Chicago_24hr 2:10 1.171 100yr_Chicago_24hr 2:15 1.185 100yr_Chicago_24hr 2:20 1.199 100yr_Chicago_24hr 2:25 1.214 100yr_Chicago_24hr 2:30 1.229 100yr_Chicago_24hr 2:35 1.245 100yr_Chicago_24hr 2:40 1.261 100yr_Chicago_24hr 2:45 1.277 100yr_Chicago_24hr 2:50 1.294 100yr_Chicago_24hr 2:55 1.312 100yr_Chicago_24hr 3:00 1.33 100yr_Chicago_24hr 3:05 1.348 100yr_Chicago_24hr 3:10 1.367 100yr_Chicago_24hr 3:15 1.387 100yr_Chicago_24hr 3:20 1.408 100yr_Chicago_24hr 3:25 1.429 100yr_Chicago_24hr 3:30 1.45 100yr_Chicago_24hr 3:35 1.473 100yr_Chicago_24hr 3:40 1.496 100yr_Chicago_24hr 3:45 1.52 100yr_Chicago_24hr 3:50 1.545 100yr_Chicago_24hr 3:55 1.571 100yr_Chicago_24hr 4:00 1.597 100yr_Chicago_24hr 4:05 1.625 100yr_Chicago_24hr 4:10 1.654 100yr_Chicago_24hr 4:15 1.684 100yr_Chicago_24hr 4:20 1.715 100yr_Chicago_24hr 4:25 1.747 100yr_Chicago_24hr 4:30 1.781 100yr_Chicago_24hr 4:35 1.817 100yr_Chicago_24hr 4:40 1.853 100yr_Chicago_24hr 4:45 1.892 100yr_Chicago_24hr 4:50 1.932 100yr_Chicago_24hr 4:55 1.975 100yr_Chicago_24hr 5:00 2.019 100yr_Chicago_24hr 5:05 2.065 100yr_Chicago_24hr 5:10 2.114 100yr_Chicago_24hr 5:15 2.166 100yr_Chicago_24hr 5:20 2.22 100yr_Chicago_24hr 5:25 2.278 100yr_Chicago_24hr 5:30 2.338 100yr_Chicago_24hr 5:35 2.403 100yr_Chicago_24hr 5:40 2.471 100yr_Chicago_24hr 5:45 2.543 100yr_Chicago_24hr 5:50 2.621 100yr_Chicago_24hr 5:55 2.704 100yr_Chicago_24hr 6:00 2.792 100yr_Chicago_24hr 6:05 2.887 100yr_Chicago_24hr 6:10 2.99 100yr_Chicago_24hr 6:15 3.1 100yr_Chicago_24hr 6:20 3.22 100yr_Chicago_24hr 6:25 3.35 100yr_Chicago_24hr 6:30 3.493 100yr_Chicago_24hr 6:35 3.648

100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr

6:40 6:45 6:50 6:55 7:00 7:05 7:10 7:15 7:20 7:25 7:30 7:35 7:40 7:45 7:50 7:55 8:00 8:05 8:10 8:15 8:20 8:25 8:30 8:35 8:40 8:45 8:50 8:55 9:00 9:05 9:10 9:15 9:20 9:25 9:30 9:35 9:40 9:45 9:50 9:55 10:00 10:05 10:10 10:15 10:20 10:25 10:30 10:35 10:40 10:45 10:50 10:55 11:00 11:05 11:10 11:15 11:20 11:25 11:30 11:35 11:40 11:45 11:50 11:55 12:00 12:05 12:10 12:15 12:20 12:25 12:30 12:35 12:40 12:45 12:50 12:55 13:00 13:05 13:10 13:15 13:20 13:25 13:30 13:35 13:40

3.82 4.009 4.221 4.457 4.723 5.026 5.372 5.774 6.244 6.802 7.475 8.303 9.344 10.693 12.504 15.055 18.888 25.214 37.305 67.486 193.627 169.127 90.119 58.886 42.853 33.325 27.101 22.758 19.576 17.155 15.256 13.732 12.483 11.442 10.562 9.81 9.158 8.59 8.09 7.646 7.249 6.894 6.572 6.281 6.015 5.772 5.548 5.342 5.152 4.975 4.811 4.658 4.514 4.38 4.254 4.136 4.024 3.919 3.819 3.725 3.635 3.55 3.469 3.392 3.319 3.249 3.182 3.118 3.057 2.998 2.941 2.887 2.835 2.785 2.737 2.69 2.646 2.602 2.561 2.52 2.482 2.444 2.408 2.372 2.338

100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr

13:45 13:50 13:55 14:00 14:05 14:10 14:15 14:20 14:25 14:30 14:35 14:40 14:45 14:50 14:55 15:00 15:05 15:10 15:15 15:20 15:25 15:30 15:35 15:40 15:45 15:50 15:55 16:00 16:05 16:10 16:15 16:20 16:25 16:30 16:35 16:40 16:45 16:50 16:55 17:00 17:05 17:10 17:15 17:20 17:25 17:30 17:35 17:40 17:45 17:50 17:55 18:00 18:05 18:10 18:15 18:20 18:25 18:30 18:35 18:40 18:45 18:50 18:55 19:00 19:05 19:10 19:15 19:20 19:25 19:30 19:35 19:40 19:45 19:50 19:55 20:00 20:05 20:10 20:15 20:20 20:25 20:30 20:35 20:40 20:45

2.305 2.273 2.242 2.211 2.182 2.154 2.126 2.099 2.073 2.047 2.022 1.998 1.974 1.951 1.929 1.907 1.886 1.865 1.845 1.825 1.806 1.787 1.768 1.75 1.732 1.715 1.698 1.681 1.665 1.649 1.634 1.618 1.604 1.589 1.575 1.56 1.547 1.533 1.52 1.507 1.494 1.481 1.469 1.457 1.445 1.433 1.422 1.411 1.4 1.389 1.378 1.367 1.357 1.347 1.337 1.327 1.317 1.308 1.298 1.289 1.28 1.271 1.262 1.254 1.245 1.237 1.228 1.22 1.212 1.204 1.196 1.188 1.181 1.173 1.166 1.158 1.151 1.144 1.137 1.13 1.123 1.117 1.11 1.103 1.097

100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr

20:50 20:55 21:00 21:05 21:10 21:15 21:20 21:25 21:30 21:35 21:40 21:45 21:50 21:55 22:00 22:05 22:10 22:15 22:20 22:25 22:30 22:35 22:40 22:45 22:50 22:55 23:00 23:05 23:10 23:15 23:20 23:25 23:30 23:35 23:40 23:45 23:50 23:55 24:00

1.09 1.084 1.078 1.072 1.066 1.06 1.054 1.048 1.042 1.036 1.031 1.025 1.02 1.014 1.009 1.003 0.998 0.993 0.988 0.983 0.978 0.973 0.968 0.963 0.958 0.953 0.949 0.944 0.939 0.935 0.93 0.926 0.921 0.917 0.913 0.908 0.904 0.9 0

;Chicago design storm, a = 646, b = 6, c = 0.781, Duration = 1440 minutes, r = 0.35, rain units = mm/hr. 2yr_Chicago_24hr 0:00 0.491 2yr_Chicago_24hr 0:05 0.494 2yr_Chicago_24hr 0:10 0.498 2yr_Chicago_24hr 0:15 0.502 2yr_Chicago_24hr 0:20 0.507 2yr_Chicago_24hr 0:25 0.511 2yr_Chicago_24hr 0:30 0.515 2yr_Chicago_24hr 0:35 0.52 2yr_Chicago_24hr 0:40 0.524 2yr_Chicago_24hr 0:45 0.529 2yr_Chicago_24hr 0:50 0.533 2yr_Chicago_24hr 0:55 0.538 2yr_Chicago_24hr 1:00 0.543 2yr_Chicago_24hr 1:05 0.548 2yr_Chicago_24hr 1:10 0.553 2yr_Chicago_24hr 1:15 0.558 2yr_Chicago_24hr 1:20 0.563 2yr_Chicago_24hr 1:25 0.568 2yr_Chicago_24hr 1:30 0.574 2yr_Chicago_24hr 1:35 0.58 2yr_Chicago_24hr 1:40 0.585 2yr_Chicago_24hr 1:45 0.591 2yr_Chicago_24hr 1:50 0.597 2yr_Chicago_24hr 1:55 0.603 2yr_Chicago_24hr 2:00 0.61 2yr_Chicago_24hr 2:05 0.616 2yr_Chicago_24hr 2:10 0.623 2yr_Chicago_24hr 2:15 0.629 2yr_Chicago_24hr 2:20 0.636 2yr_Chicago_24hr 2:25 0.643 2yr_Chicago_24hr 2:30 0.651 2yr_Chicago_24hr 2:35 0.658 2yr_Chicago_24hr 2:40 0.666 2yr_Chicago_24hr 2:45 0.674 2yr_Chicago_24hr 2:50 0.682 2yr_Chicago_24hr 2:55 0.69 2yr_Chicago_24hr 3:00 0.699 2yr_Chicago_24hr 3:05 0.707 2yr_Chicago_24hr 3:10 0.716 2yr_Chicago_24hr 3:15 0.726 2yr_Chicago_24hr 3:20 0.735 2yr_Chicago_24hr 3:25 0.745 2yr_Chicago_24hr 3:30 0.755 2yr_Chicago_24hr 3:35 0.766

2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr

3:40 3:45 3:50 3:55 4:00 4:05 4:10 4:15 4:20 4:25 4:30 4:35 4:40 4:45 4:50 4:55 5:00 5:05 5:10 5:15 5:20 5:25 5:30 5:35 5:40 5:45 5:50 5:55 6:00 6:05 6:10 6:15 6:20 6:25 6:30 6:35 6:40 6:45 6:50 6:55 7:00 7:05 7:10 7:15 7:20 7:25 7:30 7:35 7:40 7:45 7:50 7:55 8:00 8:05 8:10 8:15 8:20 8:25 8:30 8:35 8:40 8:45 8:50 8:55 9:00 9:05 9:10 9:15 9:20 9:25 9:30 9:35 9:40 9:45 9:50 9:55 10:00 10:05 10:10 10:15 10:20 10:25 10:30 10:35 10:40

0.777 0.788 0.8 0.812 0.824 0.837 0.85 0.864 0.879 0.893 0.909 0.925 0.942 0.959 0.978 0.997 1.017 1.037 1.059 1.082 1.106 1.132 1.158 1.187 1.216 1.248 1.282 1.317 1.355 1.396 1.439 1.486 1.536 1.59 1.649 1.713 1.782 1.859 1.943 2.037 2.142 2.259 2.392 2.544 2.72 2.926 3.171 3.467 3.832 4.296 4.906 5.746 6.98 8.979 12.777 22.718 82.124 65.733 30.699 19.738 14.53 11.522 9.572 8.208 7.201 6.426 5.812 5.313 4.899 4.55 4.252 3.994 3.768 3.569 3.391 3.233 3.09 2.96 2.842 2.734 2.635 2.544 2.459 2.381 2.308

2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr

10:45 10:50 10:55 11:00 11:05 11:10 11:15 11:20 11:25 11:30 11:35 11:40 11:45 11:50 11:55 12:00 12:05 12:10 12:15 12:20 12:25 12:30 12:35 12:40 12:45 12:50 12:55 13:00 13:05 13:10 13:15 13:20 13:25 13:30 13:35 13:40 13:45 13:50 13:55 14:00 14:05 14:10 14:15 14:20 14:25 14:30 14:35 14:40 14:45 14:50 14:55 15:00 15:05 15:10 15:15 15:20 15:25 15:30 15:35 15:40 15:45 15:50 15:55 16:00 16:05 16:10 16:15 16:20 16:25 16:30 16:35 16:40 16:45 16:50 16:55 17:00 17:05 17:10 17:15 17:20 17:25 17:30 17:35 17:40 17:45

2.24 2.176 2.116 2.06 2.007 1.957 1.91 1.865 1.822 1.782 1.744 1.707 1.672 1.639 1.607 1.577 1.548 1.52 1.493 1.467 1.442 1.419 1.396 1.373 1.352 1.331 1.311 1.292 1.274 1.256 1.238 1.221 1.205 1.189 1.173 1.158 1.144 1.13 1.116 1.103 1.09 1.077 1.064 1.052 1.041 1.029 1.018 1.007 0.997 0.986 0.976 0.966 0.957 0.947 0.938 0.929 0.92 0.911 0.903 0.895 0.886 0.879 0.871 0.863 0.856 0.848 0.841 0.834 0.827 0.82 0.814 0.807 0.801 0.794 0.788 0.782 0.776 0.77 0.764 0.759 0.753 0.748 0.742 0.737 0.732

2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr [REPORT] INPUT YES CONTROLS NO SUBCATCHMENTS ALL NODES ALL LINKS ALL [TAGS]

17:50 17:55 18:00 18:05 18:10 18:15 18:20 18:25 18:30 18:35 18:40 18:45 18:50 18:55 19:00 19:05 19:10 19:15 19:20 19:25 19:30 19:35 19:40 19:45 19:50 19:55 20:00 20:05 20:10 20:15 20:20 20:25 20:30 20:35 20:40 20:45 20:50 20:55 21:00 21:05 21:10 21:15 21:20 21:25 21:30 21:35 21:40 21:45 21:50 21:55 22:00 22:05 22:10 22:15 22:20 22:25 22:30 22:35 22:40 22:45 22:50 22:55 23:00 23:05 23:10 23:15 23:20 23:25 23:30 23:35 23:40 23:45 23:50 23:55 24:00

0.726 0.721 0.716 0.712 0.707 0.702 0.697 0.693 0.688 0.684 0.679 0.675 0.671 0.666 0.662 0.658 0.654 0.65 0.646 0.642 0.638 0.635 0.631 0.627 0.624 0.62 0.616 0.613 0.61 0.606 0.603 0.599 0.596 0.593 0.59 0.587 0.583 0.58 0.577 0.574 0.571 0.568 0.566 0.563 0.56 0.557 0.554 0.551 0.549 0.546 0.543 0.541 0.538 0.536 0.533 0.531 0.528 0.526 0.523 0.521 0.518 0.516 0.514 0.511 0.509 0.507 0.505 0.502 0.5 0.498 0.496 0.494 0.492 0.49 0

[MAP] DIMENSIONS UNITS

26987513.1116968 -18049644.7479964 26991668.5723983 -18044962.7536909 Feet

[COORDINATES] ;;Node X-Coord Y-Coord ;;-------------- ---------------- ---------------OF1 26987680.786 -18045155.629 [VERTICES] ;;Link X-Coord Y-Coord ;;-------------- ---------------- ---------------[POLYGONS] ;;Subcatchment ;;-------------S1 S1 S1 S1 S1 S2 S2 S2 S2 S2 S2 S2 S2 S2 S2 S2 S2 S2 S2 S2 S2 S2 S2 S2 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S4 S4 S4 S4 S4 S4 S4 S4 S4 S4 S4 S4 S4 S4 S4

X-Coord ---------------26987719.594 26987717.401 26987701.996 26988990.929 26987719.594 26990856.544 26990890.871 26991043.567 26991045.775 26988708.889 26988683.905 26987765.564 26987717.401 26987719.594 26988373.3 26988464.687 26987908.201 26987910.21 26987858.442 26987891.863 26988721.115 26988816.075 26988831.899 26990856.544 26989020.579 26988461.035 26988373.3 26988990.929 26991185.95 26991193.064 26991466.742 26991479.688 26991226.378 26991226.576 26991472.755 26991478.621 26991107.556 26991109.777 26991065.702 26991061.648 26991045.775 26991043.567 26990890.025 26990979.189 26990977.036 26991155.765 26991148.234 26991090.24 26991085.735 26991160.867 26991127.167 26991051.755 26991050.761 26989020.579 26990797.681 26990885.057 26990856.544 26988831.899 26988816.075 26988721.115 26987891.863 26987865.522 26987858.442 26987910.21 26987908.201 26988464.687 26988461.035 26988462.068 26989437.466

Y-Coord ----------------18045945.345 -18045946.144 -18045213.232 -18045199.299 -18045945.345 -18049089.716 -18049055.824 -18049396.486 -18049399.734 -18049431.93 -18048227.267 -18048237.555 -18045946.144 -18045945.345 -18045561.736 -18045666.201 -18045996.264 -18046396.727 -18046511.339 -18048104.225 -18048093.979 -18048157.488 -18049128.676 -18049089.716 -18045349.997 -18045662.026 -18045561.736 -18045199.299 -18045175.572 -18045449.141 -18045447.535 -18046880.147 -18046890.544 -18047281.831 -18047282.593 -18048539.046 -18048540.69 -18049227.733 -18049228.583 -18049399.515 -18049399.734 -18049396.486 -18049053.937 -18048968.044 -18048414.159 -18048402.192 -18047422.332 -18047360.958 -18046832.706 -18046751.723 -18045593.462 -18045512.545 -18045313.735 -18045349.997 -18048914.299 -18049061.564 -18049089.716 -18049128.676 -18048157.488 -18048093.979 -18048104.225 -18046848.775 -18046511.339 -18046396.727 -18045996.264 -18045666.201 -18045662.026 -18045661.45 -18046856.759

S4 S4 S4 S4 S4 S5 S5 S5 S5 S5 S5 S5 S5 S5 S5 S5 S5 S5 S5 S5 S5 S5 S5 S5 S5 S5 S5 S5

26989584.893 26989701.422 26989860.613 26989995.984 26990797.681 26989437.466 26988462.068 26989020.579 26991050.761 26991051.755 26991127.167 26991140.484 26991160.867 26991085.735 26991090.24 26991148.234 26991155.765 26990977.036 26990979.189 26990890.025 26990890.871 26990885.057 26990797.681 26989995.984 26989860.613 26989701.422 26989584.893 26989437.466

-18046924.28 -18047073.577 -18047471.016 -18048036.698 -18048914.299 -18046856.759 -18045661.45 -18045349.997 -18045313.735 -18045512.545 -18045593.462 -18046051.15 -18046751.723 -18046832.706 -18047360.958 -18047422.332 -18048402.192 -18048414.159 -18048968.044 -18049053.937 -18049055.824 -18049061.564 -18048914.299 -18048036.698 -18047471.016 -18047073.577 -18046924.28 -18046856.759

[SYMBOLS] ;;Gage X-Coord Y-Coord ;;-------------- ---------------- ----------------

EPA STORM WATER MANAGEMENT MODEL - VERSION 5.1 (Build 5.1.012) --------------------------------------------------------------

************* Element Count ************* Number of rain gages ...... Number of subcatchments ... Number of nodes ........... Number of links ........... Number of pollutants ...... Number of land uses .......

2 5 1 0 0 0

**************** Raingage Summary **************** Data Recording Name Data Source Type Interval -----------------------------------------------------------------------100yr_Chicago_24hr 100yr_Chicago_24hr INTENSITY 5 min. 2yr_Chicago_24hr 2yr_Chicago_24hr INTENSITY 5 min.

******************** Subcatchment Summary ******************** Name Area Width %Imperv %Slope Rain Gage Outlet ----------------------------------------------------------------------------------------------------------S1 2.47 493.10 25.00 0.5000 100yr_Chicago_24hr OF1 S2 7.05 587.85 5.00 0.5000 100yr_Chicago_24hr OF1 S3 7.91 659.53 5.00 0.5000 100yr_Chicago_24hr OF1 S4 27.61 600.22 5.00 5.0000 100yr_Chicago_24hr OF1 S5 28.76 777.27 5.00 5.0000 100yr_Chicago_24hr OF1

************ Node Summary ************ Invert Max. Ponded External Name Type Elev. Depth Area Inflow ------------------------------------------------------------------------------OF1 OUTFALL 190.20 0.00 0.0

********************************************************* NOTE: The summary statistics displayed in this report are based on results found at every computational time step, not just on results from each reporting time step. ********************************************************* **************** Analysis Options **************** Flow Units ............... Process Models: Rainfall/Runoff ........ RDII ................... Snowmelt ............... Groundwater ............ Flow Routing ........... Water Quality .......... Infiltration Method ...... Starting Date ............ Ending Date .............. Antecedent Dry Days ...... Report Time Step ......... Wet Time Step ............ Dry Time Step ............

CMS YES NO NO NO NO NO CURVE_NUMBER 01/29/2018 00:00:00 02/03/2018 00:00:00 0.0 00:01:00 00:05:00 00:05:00

************************** Runoff Quantity Continuity ************************** Total Precipitation ...... Evaporation Loss ......... Infiltration Loss ........ Surface Runoff ........... Final Storage ............ Continuity Error (%) .....

Volume hectare-m --------9.335 0.000 3.070 6.173 0.097 -0.052

Depth mm ------126.491 0.000 41.601 83.648 1.308

**************************

Volume

Volume

Flow Routing Continuity ************************** Dry Weather Inflow ....... Wet Weather Inflow ....... Groundwater Inflow ....... RDII Inflow .............. External Inflow .......... External Outflow ......... Flooding Loss ............ Evaporation Loss ......... Exfiltration Loss ........ Initial Stored Volume .... Final Stored Volume ...... Continuity Error (%) .....

hectare-m --------0.000 6.173 0.000 0.000 0.000 6.173 0.000 0.000 0.000 0.000 0.000 0.000

10^6 ltr --------0.000 61.736 0.000 0.000 0.000 61.736 0.000 0.000 0.000 0.000 0.000

*************************** Subcatchment Runoff Summary *************************** -------------------------------------------------------------------------------------------------------Total Total Total Total Total Total Peak Runoff Precip Runon Evap Infil Runoff Runoff Runoff Coeff Subcatchment mm mm mm mm mm 10^6 ltr CMS -------------------------------------------------------------------------------------------------------S1 126.49 0.00 0.00 42.69 82.47 2.03 0.47 0.652 S2 126.49 0.00 0.00 54.89 70.35 4.96 0.45 0.556 S3 126.49 0.00 0.00 54.89 70.35 5.57 0.50 0.556 S4 126.49 0.00 0.00 38.11 87.14 24.06 2.30 0.689 S5 126.49 0.00 0.00 37.94 87.32 25.11 2.76 0.690

Analysis begun on: Thu Jun 07 17:59:27 2018 Analysis ended on: Thu Jun 07 17:59:27 2018 Total elapsed time: < 1 sec

Appendix C Preferred Landfill Footprint Controlled Modeling (with SWM Ponds) Inputs and Outputs

GHD | Draft Surface Water Impact Assessment Technical Report| 11102771

[TITLE]

[OPTIONS] ;;Options ;;-----------------FLOW_UNITS INFILTRATION FLOW_ROUTING START_DATE START_TIME REPORT_START_DATE REPORT_START_TIME END_DATE END_TIME SWEEP_START SWEEP_END DRY_DAYS REPORT_STEP WET_STEP DRY_STEP ROUTING_STEP ALLOW_PONDING INERTIAL_DAMPING VARIABLE_STEP LENGTHENING_STEP MIN_SURFAREA NORMAL_FLOW_LIMITED SKIP_STEADY_STATE FORCE_MAIN_EQUATION LINK_OFFSETS MIN_SLOPE MAX_TRIALS HEAD_TOLERANCE SYS_FLOW_TOL LAT_FLOW_TOL MINIMUM_STEP THREADS

Value -----------CMS CURVE_NUMBER DYNWAVE 01/29/2018 00:00:00 01/29/2018 00:00:00 02/03/2018 00:00:00 01/01 12/31 0 00:01:00 00:05:00 00:05:00 5 NO PARTIAL 0.75 0 0 BOTH NO H-W DEPTH 0 8 0.0015 5 5 0.5 2

[EVAPORATION] ;;Type Parameters ;;------------- ---------CONSTANT 0.0 DRY_ONLY NO [RAINGAGES] ;; ;;Name ;;---------------100yr_Chicago_24hr 2yr_Chicago_24hr

Rain Type --------INTENSITY INTENSITY

Time Intrvl -----0:05 0:05

Snow Catch -----1.0 1.0

Data Source ---------TIMESERIES 100yr_Chicago_24hr TIMESERIES 2yr_Chicago_24hr

[SUBCATCHMENTS] ;; ;;Name ;;-------------S1 S2 S3 S4 S5

Raingage Outlet ---------------- ---------------100yr_Chicago_24hr SWM_Pond 100yr_Chicago_24hr J5 100yr_Chicago_24hr J2 100yr_Chicago_24hr J6 100yr_Chicago_24hr J1

[SUBAREAS] ;;Subcatchment ;;-------------S1 S2 S3 S4 S5

N-Imperv ---------0.011 0.011 0.011 0.011 0.011

N-Perv ---------0.24 0.24 0.24 0.24 0.24

S-Imperv ---------2 2 2 2 2

[INFILTRATION] ;;Subcatchment ;;-------------S1 S2 S3 S4 S5

CurveNum ---------74 74 74 84 84

HydCon ---------0.5 0.5 0.5 0.5 0.5

DryTime ---------7 7 7 7 7

[JUNCTIONS] ;; ;;Name ;;-------------J1

Invert Elev. ---------208

Max. Depth ---------1

Init. Depth ---------0

Total Area -------2.4655 7.0542 7.9144 27.6099 28.759

Pcnt. Imperv -------25 5 5 5 5

Width -------493.1 587.85 659.533 600.215 777.27

S-Perv ---------5 5 5 5 5

PctZero ---------0 0 0 0 0

Surcharge Depth ---------0

Ponded Area ---------0

Pcnt. Slope -------0.5 0.5 0.5 5 5

Curb Snow Length Pack -------- -------0 0 0 0 0

RouteTo PctRouted ---------- ---------OUTLET OUTLET OUTLET OUTLET OUTLET

J2 J3 J4 J5 J6 J7

204.17 198 198 201.6 208 190.35

1 1 1 1 1 1.4

[OUTFALLS] ;; ;;Name ;;-------------OF1

Invert Elev. ---------190.2

Outfall Stage/Table Type Time Series ------------ ---------------NORMAL

[STORAGE] ;; Invert ;;Name Elev. Infiltration parameters ;;-------------- ------------------East_Forebay 193 SWM_Pond 191 West_Forebay 194.5 [CONDUITS] ;; ;;Name ;;-----------------C1 C2 C3 C4 C5 C6 C7 C8 C9

Max. Depth

0 0 0 0 0 0

Init. Depth

0 0 0 0 0 0

Storage Curve

0 0 0 0 0 0

Tide Gate Route To ---- ---------------NO

Curve Params

Ponded Area

Evap. Frac.

-------- -------- ---------- -------- -------- -------- -------- -------- ----------4.3 4.3 3.8

2 2 1.5

TABULAR TABULAR TABULAR

Detention_East_Forebey New_Detention forebay_west

0 0 0

0 0 0

Inlet Outlet Manning Inlet Outlet Init. Max. Node Node Length N Offset Offset Flow Flow ---------------- ---------------- ---------- ---------- ---------- ---------- ---------- ----J6 J5 J1 J2 J4 J3 J7 West_Forebay East_Forebay

J5 J4 J2 J3 West_Forebay East_Forebay OF1 SWM_Pond SWM_Pond

911.42 511.94 543.59 875.29 55.227 99.171 21.51 20 20

[ORIFICES] ;; ;;Name ;;-------------OR1

Inlet Node ---------------SWM_Pond

Outlet Node ---------------J7

Orifice Type -----------SIDE

[XSECTIONS] ;;Link ;;-------------C1 C2 C3 C4 C5 C6 C7 C8 C9 OR1

Shape -----------TRAPEZOIDAL TRAPEZOIDAL TRAPEZOIDAL TRAPEZOIDAL TRAPEZOIDAL TRAPEZOIDAL CIRCULAR CIRCULAR CIRCULAR CIRCULAR

Geom1 ---------------1 1 1 1 1 1 1.35 0.6 0.6 1

Geom2 ---------1 1 1 1 1 1 0 0 0 0

0.035 0.035 0.035 0.035 0.035 0.035 0.013 0.013 0.013

0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

Crest Height ---------0

Disch. Coeff. ---------0.62

Geom3 ---------3 3 3 3 3 3 0 0 0 0

Geom4 ---------3 3 3 3 3 3 0 0 0 0

[LOSSES] ;;Link Inlet Outlet Average Flap Gate SeepageRate ;;-------------- ---------- ---------- ---------- ---------- ---------[CURVES] ;;Name Type X-Value Y-Value ;;-------------- ---------- ---------- ---------Detention_East_Forebey Storage 0 513 Detention_East_Forebey 1 949 Detention_East_Forebey 2 1493 Detention_East_Forebey 3 2173 Detention_East_Forebey 4 2987 Detention_East_Forebey 4.3 3243 forebay_west forebay_west forebay_west forebay_west forebay_west forebay_west

Storage

0 0.5 1.5 2.5 3.5 3.8

26 77 244 487 820 936

Ivan_Detention Ivan_Detention Ivan_Detention

Storage

0 0.5 1

1923 2301 2698

New_Detention New_Detention

Storage

0 1

1923 2698

0 0 0 0 0 0 0 0 0

Flap Gate ---NO

Barrels ---------1 1 1 1 1 1 1 1 1

Open/Close Time ---------0

0 0 0 0 0 0 0 0 0

New_Detention New_Detention New_Detention New_Detention

2 3 4 4.3

3455 4089 4486 4698

[TIMESERIES] ;;Name Date Time Value ;;-------------- ---------- ---------- ---------;Chicago design storm, a = 2317.4, b = 11, c = 0.836, Duration = 1440 minutes, r = 0.35, rain units = mm/hr. 100yr_Chicago_24hr 0:00 0.902 100yr_Chicago_24hr 0:05 0.91 100yr_Chicago_24hr 0:10 0.918 100yr_Chicago_24hr 0:15 0.926 100yr_Chicago_24hr 0:20 0.934 100yr_Chicago_24hr 0:25 0.943 100yr_Chicago_24hr 0:30 0.951 100yr_Chicago_24hr 0:35 0.96 100yr_Chicago_24hr 0:40 0.969 100yr_Chicago_24hr 0:45 0.978 100yr_Chicago_24hr 0:50 0.988 100yr_Chicago_24hr 0:55 0.997 100yr_Chicago_24hr 1:00 1.007 100yr_Chicago_24hr 1:05 1.017 100yr_Chicago_24hr 1:10 1.027 100yr_Chicago_24hr 1:15 1.038 100yr_Chicago_24hr 1:20 1.049 100yr_Chicago_24hr 1:25 1.06 100yr_Chicago_24hr 1:30 1.071 100yr_Chicago_24hr 1:35 1.082 100yr_Chicago_24hr 1:40 1.094 100yr_Chicago_24hr 1:45 1.106 100yr_Chicago_24hr 1:50 1.119 100yr_Chicago_24hr 1:55 1.131 100yr_Chicago_24hr 2:00 1.144 100yr_Chicago_24hr 2:05 1.157 100yr_Chicago_24hr 2:10 1.171 100yr_Chicago_24hr 2:15 1.185 100yr_Chicago_24hr 2:20 1.199 100yr_Chicago_24hr 2:25 1.214 100yr_Chicago_24hr 2:30 1.229 100yr_Chicago_24hr 2:35 1.245 100yr_Chicago_24hr 2:40 1.261 100yr_Chicago_24hr 2:45 1.277 100yr_Chicago_24hr 2:50 1.294 100yr_Chicago_24hr 2:55 1.312 100yr_Chicago_24hr 3:00 1.33 100yr_Chicago_24hr 3:05 1.348 100yr_Chicago_24hr 3:10 1.367 100yr_Chicago_24hr 3:15 1.387 100yr_Chicago_24hr 3:20 1.408 100yr_Chicago_24hr 3:25 1.429 100yr_Chicago_24hr 3:30 1.45 100yr_Chicago_24hr 3:35 1.473 100yr_Chicago_24hr 3:40 1.496 100yr_Chicago_24hr 3:45 1.52 100yr_Chicago_24hr 3:50 1.545 100yr_Chicago_24hr 3:55 1.571 100yr_Chicago_24hr 4:00 1.597 100yr_Chicago_24hr 4:05 1.625 100yr_Chicago_24hr 4:10 1.654 100yr_Chicago_24hr 4:15 1.684 100yr_Chicago_24hr 4:20 1.715 100yr_Chicago_24hr 4:25 1.747 100yr_Chicago_24hr 4:30 1.781 100yr_Chicago_24hr 4:35 1.817 100yr_Chicago_24hr 4:40 1.853 100yr_Chicago_24hr 4:45 1.892 100yr_Chicago_24hr 4:50 1.932 100yr_Chicago_24hr 4:55 1.975 100yr_Chicago_24hr 5:00 2.019 100yr_Chicago_24hr 5:05 2.065 100yr_Chicago_24hr 5:10 2.114 100yr_Chicago_24hr 5:15 2.166 100yr_Chicago_24hr 5:20 2.22 100yr_Chicago_24hr 5:25 2.278 100yr_Chicago_24hr 5:30 2.338 100yr_Chicago_24hr 5:35 2.403 100yr_Chicago_24hr 5:40 2.471 100yr_Chicago_24hr 5:45 2.543 100yr_Chicago_24hr 5:50 2.621 100yr_Chicago_24hr 5:55 2.704 100yr_Chicago_24hr 6:00 2.792 100yr_Chicago_24hr 6:05 2.887 100yr_Chicago_24hr 6:10 2.99 100yr_Chicago_24hr 6:15 3.1

100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr

6:20 6:25 6:30 6:35 6:40 6:45 6:50 6:55 7:00 7:05 7:10 7:15 7:20 7:25 7:30 7:35 7:40 7:45 7:50 7:55 8:00 8:05 8:10 8:15 8:20 8:25 8:30 8:35 8:40 8:45 8:50 8:55 9:00 9:05 9:10 9:15 9:20 9:25 9:30 9:35 9:40 9:45 9:50 9:55 10:00 10:05 10:10 10:15 10:20 10:25 10:30 10:35 10:40 10:45 10:50 10:55 11:00 11:05 11:10 11:15 11:20 11:25 11:30 11:35 11:40 11:45 11:50 11:55 12:00 12:05 12:10 12:15 12:20 12:25 12:30 12:35 12:40 12:45 12:50 12:55 13:00 13:05 13:10 13:15 13:20

3.22 3.35 3.493 3.648 3.82 4.009 4.221 4.457 4.723 5.026 5.372 5.774 6.244 6.802 7.475 8.303 9.344 10.693 12.504 15.055 18.888 25.214 37.305 67.486 193.627 169.127 90.119 58.886 42.853 33.325 27.101 22.758 19.576 17.155 15.256 13.732 12.483 11.442 10.562 9.81 9.158 8.59 8.09 7.646 7.249 6.894 6.572 6.281 6.015 5.772 5.548 5.342 5.152 4.975 4.811 4.658 4.514 4.38 4.254 4.136 4.024 3.919 3.819 3.725 3.635 3.55 3.469 3.392 3.319 3.249 3.182 3.118 3.057 2.998 2.941 2.887 2.835 2.785 2.737 2.69 2.646 2.602 2.561 2.52 2.482

100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr

13:25 13:30 13:35 13:40 13:45 13:50 13:55 14:00 14:05 14:10 14:15 14:20 14:25 14:30 14:35 14:40 14:45 14:50 14:55 15:00 15:05 15:10 15:15 15:20 15:25 15:30 15:35 15:40 15:45 15:50 15:55 16:00 16:05 16:10 16:15 16:20 16:25 16:30 16:35 16:40 16:45 16:50 16:55 17:00 17:05 17:10 17:15 17:20 17:25 17:30 17:35 17:40 17:45 17:50 17:55 18:00 18:05 18:10 18:15 18:20 18:25 18:30 18:35 18:40 18:45 18:50 18:55 19:00 19:05 19:10 19:15 19:20 19:25 19:30 19:35 19:40 19:45 19:50 19:55 20:00 20:05 20:10 20:15 20:20 20:25

2.444 2.408 2.372 2.338 2.305 2.273 2.242 2.211 2.182 2.154 2.126 2.099 2.073 2.047 2.022 1.998 1.974 1.951 1.929 1.907 1.886 1.865 1.845 1.825 1.806 1.787 1.768 1.75 1.732 1.715 1.698 1.681 1.665 1.649 1.634 1.618 1.604 1.589 1.575 1.56 1.547 1.533 1.52 1.507 1.494 1.481 1.469 1.457 1.445 1.433 1.422 1.411 1.4 1.389 1.378 1.367 1.357 1.347 1.337 1.327 1.317 1.308 1.298 1.289 1.28 1.271 1.262 1.254 1.245 1.237 1.228 1.22 1.212 1.204 1.196 1.188 1.181 1.173 1.166 1.158 1.151 1.144 1.137 1.13 1.123

100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr 100yr_Chicago_24hr

20:30 20:35 20:40 20:45 20:50 20:55 21:00 21:05 21:10 21:15 21:20 21:25 21:30 21:35 21:40 21:45 21:50 21:55 22:00 22:05 22:10 22:15 22:20 22:25 22:30 22:35 22:40 22:45 22:50 22:55 23:00 23:05 23:10 23:15 23:20 23:25 23:30 23:35 23:40 23:45 23:50 23:55 24:00

1.117 1.11 1.103 1.097 1.09 1.084 1.078 1.072 1.066 1.06 1.054 1.048 1.042 1.036 1.031 1.025 1.02 1.014 1.009 1.003 0.998 0.993 0.988 0.983 0.978 0.973 0.968 0.963 0.958 0.953 0.949 0.944 0.939 0.935 0.93 0.926 0.921 0.917 0.913 0.908 0.904 0.9 0

;Chicago design storm, a = 646, b = 6, c = 0.781, Duration = 1440 minutes, r = 0.35, rain units = mm/hr. 2yr_Chicago_24hr 0:00 0.491 2yr_Chicago_24hr 0:05 0.494 2yr_Chicago_24hr 0:10 0.498 2yr_Chicago_24hr 0:15 0.502 2yr_Chicago_24hr 0:20 0.507 2yr_Chicago_24hr 0:25 0.511 2yr_Chicago_24hr 0:30 0.515 2yr_Chicago_24hr 0:35 0.52 2yr_Chicago_24hr 0:40 0.524 2yr_Chicago_24hr 0:45 0.529 2yr_Chicago_24hr 0:50 0.533 2yr_Chicago_24hr 0:55 0.538 2yr_Chicago_24hr 1:00 0.543 2yr_Chicago_24hr 1:05 0.548 2yr_Chicago_24hr 1:10 0.553 2yr_Chicago_24hr 1:15 0.558 2yr_Chicago_24hr 1:20 0.563 2yr_Chicago_24hr 1:25 0.568 2yr_Chicago_24hr 1:30 0.574 2yr_Chicago_24hr 1:35 0.58 2yr_Chicago_24hr 1:40 0.585 2yr_Chicago_24hr 1:45 0.591 2yr_Chicago_24hr 1:50 0.597 2yr_Chicago_24hr 1:55 0.603 2yr_Chicago_24hr 2:00 0.61 2yr_Chicago_24hr 2:05 0.616 2yr_Chicago_24hr 2:10 0.623 2yr_Chicago_24hr 2:15 0.629 2yr_Chicago_24hr 2:20 0.636 2yr_Chicago_24hr 2:25 0.643 2yr_Chicago_24hr 2:30 0.651 2yr_Chicago_24hr 2:35 0.658 2yr_Chicago_24hr 2:40 0.666 2yr_Chicago_24hr 2:45 0.674 2yr_Chicago_24hr 2:50 0.682 2yr_Chicago_24hr 2:55 0.69 2yr_Chicago_24hr 3:00 0.699 2yr_Chicago_24hr 3:05 0.707 2yr_Chicago_24hr 3:10 0.716 2yr_Chicago_24hr 3:15 0.726

2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr

3:20 3:25 3:30 3:35 3:40 3:45 3:50 3:55 4:00 4:05 4:10 4:15 4:20 4:25 4:30 4:35 4:40 4:45 4:50 4:55 5:00 5:05 5:10 5:15 5:20 5:25 5:30 5:35 5:40 5:45 5:50 5:55 6:00 6:05 6:10 6:15 6:20 6:25 6:30 6:35 6:40 6:45 6:50 6:55 7:00 7:05 7:10 7:15 7:20 7:25 7:30 7:35 7:40 7:45 7:50 7:55 8:00 8:05 8:10 8:15 8:20 8:25 8:30 8:35 8:40 8:45 8:50 8:55 9:00 9:05 9:10 9:15 9:20 9:25 9:30 9:35 9:40 9:45 9:50 9:55 10:00 10:05 10:10 10:15 10:20

0.735 0.745 0.755 0.766 0.777 0.788 0.8 0.812 0.824 0.837 0.85 0.864 0.879 0.893 0.909 0.925 0.942 0.959 0.978 0.997 1.017 1.037 1.059 1.082 1.106 1.132 1.158 1.187 1.216 1.248 1.282 1.317 1.355 1.396 1.439 1.486 1.536 1.59 1.649 1.713 1.782 1.859 1.943 2.037 2.142 2.259 2.392 2.544 2.72 2.926 3.171 3.467 3.832 4.296 4.906 5.746 6.98 8.979 12.777 22.718 82.124 65.733 30.699 19.738 14.53 11.522 9.572 8.208 7.201 6.426 5.812 5.313 4.899 4.55 4.252 3.994 3.768 3.569 3.391 3.233 3.09 2.96 2.842 2.734 2.635

2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr

10:25 10:30 10:35 10:40 10:45 10:50 10:55 11:00 11:05 11:10 11:15 11:20 11:25 11:30 11:35 11:40 11:45 11:50 11:55 12:00 12:05 12:10 12:15 12:20 12:25 12:30 12:35 12:40 12:45 12:50 12:55 13:00 13:05 13:10 13:15 13:20 13:25 13:30 13:35 13:40 13:45 13:50 13:55 14:00 14:05 14:10 14:15 14:20 14:25 14:30 14:35 14:40 14:45 14:50 14:55 15:00 15:05 15:10 15:15 15:20 15:25 15:30 15:35 15:40 15:45 15:50 15:55 16:00 16:05 16:10 16:15 16:20 16:25 16:30 16:35 16:40 16:45 16:50 16:55 17:00 17:05 17:10 17:15 17:20 17:25

2.544 2.459 2.381 2.308 2.24 2.176 2.116 2.06 2.007 1.957 1.91 1.865 1.822 1.782 1.744 1.707 1.672 1.639 1.607 1.577 1.548 1.52 1.493 1.467 1.442 1.419 1.396 1.373 1.352 1.331 1.311 1.292 1.274 1.256 1.238 1.221 1.205 1.189 1.173 1.158 1.144 1.13 1.116 1.103 1.09 1.077 1.064 1.052 1.041 1.029 1.018 1.007 0.997 0.986 0.976 0.966 0.957 0.947 0.938 0.929 0.92 0.911 0.903 0.895 0.886 0.879 0.871 0.863 0.856 0.848 0.841 0.834 0.827 0.82 0.814 0.807 0.801 0.794 0.788 0.782 0.776 0.77 0.764 0.759 0.753

2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr 2yr_Chicago_24hr [REPORT] INPUT YES CONTROLS NO SUBCATCHMENTS ALL NODES ALL

17:30 17:35 17:40 17:45 17:50 17:55 18:00 18:05 18:10 18:15 18:20 18:25 18:30 18:35 18:40 18:45 18:50 18:55 19:00 19:05 19:10 19:15 19:20 19:25 19:30 19:35 19:40 19:45 19:50 19:55 20:00 20:05 20:10 20:15 20:20 20:25 20:30 20:35 20:40 20:45 20:50 20:55 21:00 21:05 21:10 21:15 21:20 21:25 21:30 21:35 21:40 21:45 21:50 21:55 22:00 22:05 22:10 22:15 22:20 22:25 22:30 22:35 22:40 22:45 22:50 22:55 23:00 23:05 23:10 23:15 23:20 23:25 23:30 23:35 23:40 23:45 23:50 23:55 24:00

0.748 0.742 0.737 0.732 0.726 0.721 0.716 0.712 0.707 0.702 0.697 0.693 0.688 0.684 0.679 0.675 0.671 0.666 0.662 0.658 0.654 0.65 0.646 0.642 0.638 0.635 0.631 0.627 0.624 0.62 0.616 0.613 0.61 0.606 0.603 0.599 0.596 0.593 0.59 0.587 0.583 0.58 0.577 0.574 0.571 0.568 0.566 0.563 0.56 0.557 0.554 0.551 0.549 0.546 0.543 0.541 0.538 0.536 0.533 0.531 0.528 0.526 0.523 0.521 0.518 0.516 0.514 0.511 0.509 0.507 0.505 0.502 0.5 0.498 0.496 0.494 0.492 0.49 0

LINKS ALL [TAGS] [MAP] DIMENSIONS UNITS

26987490.8413855 -18049645.7451045 26991669.6328893 -18044941.8144193 Feet

[COORDINATES] ;;Node ;;-------------J1 J2 J3 J4 J5 J6 J7 OF1 East_Forebay SWM_Pond West_Forebay

X-Coord ---------------26990938.449 26991190.499 26988907.888 26987801.701 26987865.055 26990868.374 26987731.108 26987680.786 26988473.796 26987779.221 26987775.065

Y-Coord ----------------18049071.382 -18046849.865 -18045267.007 -18045903.393 -18048144.173 -18049128.659 -18045235.237 -18045155.629 -18045255.176 -18045288.384 -18045663.028

[VERTICES] ;;Link ;;-------------C1 C1 C1 C2 C3 C3 C3 C3 C4

X-Coord ---------------26988794.785 26988776.131 26988723.942 26987828.071 26991002.562 26991007.719 26991169.959 26991185.936 26991154.836

Y-Coord ----------------18049168.56 -18048197.85 -18048127.676 -18046482.438 -18048968.462 -18048444.693 -18048421.228 -18047404.106 -18045264.398

[POLYGONS] ;;Subcatchment ;;-------------S1 S1 S1 S1 S1 S2 S2 S2 S2 S2 S2 S2 S2 S2 S2 S2 S2 S2 S2 S2 S2 S2 S2 S2 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3 S3

X-Coord ---------------26987719.594 26987717.401 26987701.996 26988990.929 26987719.594 26990856.544 26990890.871 26991043.567 26991045.775 26988708.889 26988683.905 26987765.564 26987717.401 26987719.594 26988373.3 26988464.687 26987908.201 26987910.21 26987858.442 26987891.863 26988721.115 26988816.075 26988831.899 26990856.544 26989020.579 26988461.035 26988373.3 26988990.929 26991185.95 26991193.064 26991466.742 26991479.688 26991226.378 26991226.576 26991472.755 26991478.621 26991107.556 26991109.777 26991065.702 26991061.648 26991045.775 26991043.567 26990890.025 26990979.189 26990977.036 26991155.765

Y-Coord ----------------18045945.345 -18045946.144 -18045213.232 -18045199.299 -18045945.345 -18049089.716 -18049055.824 -18049396.486 -18049399.734 -18049431.93 -18048227.267 -18048237.555 -18045946.144 -18045945.345 -18045561.736 -18045666.201 -18045996.264 -18046396.727 -18046511.339 -18048104.225 -18048093.979 -18048157.488 -18049128.676 -18049089.716 -18045349.997 -18045662.026 -18045561.736 -18045199.299 -18045175.572 -18045449.141 -18045447.535 -18046880.147 -18046890.544 -18047281.831 -18047282.593 -18048539.046 -18048540.69 -18049227.733 -18049228.583 -18049399.515 -18049399.734 -18049396.486 -18049053.937 -18048968.044 -18048414.159 -18048402.192

S3 S3 S3 S3 S3 S3 S3 S3 S4 S4 S4 S4 S4 S4 S4 S4 S4 S4 S4 S4 S4 S4 S4 S4 S4 S4 S4 S4 S5 S5 S5 S5 S5 S5 S5 S5 S5 S5 S5 S5 S5 S5 S5 S5 S5 S5 S5 S5 S5 S5 S5

26991148.234 26991090.24 26991085.735 26991160.867 26991127.167 26991051.755 26991050.761 26989020.579 26990797.681 26990885.057 26990856.544 26988831.899 26988816.075 26988721.115 26987891.863 26987865.522 26987858.442 26987910.21 26987908.201 26988464.687 26988461.035 26988462.068 26989437.466 26989584.893 26989701.422 26989860.613 26989995.984 26990797.681 26989437.466 26988462.068 26989020.579 26991050.761 26991051.755 26991127.167 26991140.484 26991160.867 26991085.735 26991090.24 26991148.234 26991155.765 26990977.036 26990979.189 26990890.025 26990890.871 26990885.057 26990797.681 26989995.984 26989860.613 26989701.422 26989584.893 26989437.466

-18047422.332 -18047360.958 -18046832.706 -18046751.723 -18045593.462 -18045512.545 -18045313.735 -18045349.997 -18048914.299 -18049061.564 -18049089.716 -18049128.676 -18048157.488 -18048093.979 -18048104.225 -18046848.775 -18046511.339 -18046396.727 -18045996.264 -18045666.201 -18045662.026 -18045661.45 -18046856.759 -18046924.28 -18047073.577 -18047471.016 -18048036.698 -18048914.299 -18046856.759 -18045661.45 -18045349.997 -18045313.735 -18045512.545 -18045593.462 -18046051.15 -18046751.723 -18046832.706 -18047360.958 -18047422.332 -18048402.192 -18048414.159 -18048968.044 -18049053.937 -18049055.824 -18049061.564 -18048914.299 -18048036.698 -18047471.016 -18047073.577 -18046924.28 -18046856.759

[SYMBOLS] ;;Gage X-Coord Y-Coord ;;-------------- ---------------- ----------------

EPA STORM WATER MANAGEMENT MODEL - VERSION 5.1 (Build 5.1.012) --------------------------------------------------------------

************* Element Count ************* Number of rain gages ...... Number of subcatchments ... Number of nodes ........... Number of links ........... Number of pollutants ...... Number of land uses .......

2 5 11 10 0 0

**************** Raingage Summary **************** Data Recording Name Data Source Type Interval -----------------------------------------------------------------------100yr_Chicago_24hr 100yr_Chicago_24hr INTENSITY 5 min. 2yr_Chicago_24hr 2yr_Chicago_24hr INTENSITY 5 min.

******************** Subcatchment Summary ******************** Name Area Width %Imperv %Slope Rain Gage Outlet ----------------------------------------------------------------------------------------------------------S1 2.47 493.10 25.00 0.5000 100yr_Chicago_24hr SWM_Pond S2 7.05 587.85 5.00 0.5000 100yr_Chicago_24hr J5 S3 7.91 659.53 5.00 0.5000 100yr_Chicago_24hr J2 S4 27.61 600.22 5.00 5.0000 100yr_Chicago_24hr J6 S5 28.76 777.27 5.00 5.0000 100yr_Chicago_24hr J1

************ Node Summary ************ Invert Max. Ponded External Name Type Elev. Depth Area Inflow ------------------------------------------------------------------------------J1 JUNCTION 208.00 1.00 0.0 J2 JUNCTION 204.17 1.00 0.0 J3 JUNCTION 198.00 1.00 0.0 J4 JUNCTION 198.00 1.00 0.0 J5 JUNCTION 201.60 1.00 0.0 J6 JUNCTION 208.00 1.00 0.0 J7 JUNCTION 190.35 1.40 0.0 OF1 OUTFALL 190.20 1.35 0.0 East_Forebay STORAGE 193.00 4.30 0.0 SWM_Pond STORAGE 191.00 4.30 0.0 West_Forebay STORAGE 194.50 3.80 0.0

************ Link Summary ************ Name From Node To Node Type Length %Slope Roughness --------------------------------------------------------------------------------------------C1 J6 J5 CONDUIT 911.4 0.7022 0.0350 C2 J5 J4 CONDUIT 511.9 0.7032 0.0350 C3 J1 J2 CONDUIT 543.6 0.7046 0.0350 C4 J2 J3 CONDUIT 875.3 0.7049 0.0350 C5 J4 West_Forebay CONDUIT 55.2 6.3502 0.0350 C6 J3 East_Forebay CONDUIT 99.2 5.0482 0.0350 C7 J7 OF1 CONDUIT 21.5 0.6974 0.0130 C8 West_Forebay SWM_Pond CONDUIT 20.0 17.7743 0.0130 C9 East_Forebay SWM_Pond CONDUIT 20.0 10.0504 0.0130 OR1 SWM_Pond J7 ORIFICE

********************* Cross Section Summary ********************* Full Full Hyd. Max. No. of Full Conduit Shape Depth Area Rad. Width Barrels Flow --------------------------------------------------------------------------------------C1 TRAPEZOIDAL 1.00 4.00 0.55 7.00 1 6.40 C2 TRAPEZOIDAL 1.00 4.00 0.55 7.00 1 6.40 C3 TRAPEZOIDAL 1.00 4.00 0.55 7.00 1 6.41 C4 TRAPEZOIDAL 1.00 4.00 0.55 7.00 1 6.41 C5 TRAPEZOIDAL 1.00 4.00 0.55 7.00 1 19.24 C6 TRAPEZOIDAL 1.00 4.00 0.55 7.00 1 17.16

C7 C8 C9

CIRCULAR CIRCULAR CIRCULAR

1.35 0.60 0.60

1.43 0.28 0.28

0.34 0.15 0.15

********************************************************* NOTE: The summary statistics displayed in this report are based on results found at every computational time step, not just on results from each reporting time step. ********************************************************* **************** Analysis Options **************** Flow Units ............... Process Models: Rainfall/Runoff ........ RDII ................... Snowmelt ............... Groundwater ............ Flow Routing ........... Ponding Allowed ........ Water Quality .......... Infiltration Method ...... Flow Routing Method ...... Starting Date ............ Ending Date .............. Antecedent Dry Days ...... Report Time Step ......... Wet Time Step ............ Dry Time Step ............ Routing Time Step ........ Variable Time Step ....... Maximum Trials ........... Number of Threads ........ Head Tolerance ...........

CMS YES NO NO NO YES NO NO CURVE_NUMBER DYNWAVE 01/29/2018 00:00:00 02/03/2018 00:00:00 0.0 00:01:00 00:05:00 00:05:00 5.00 sec YES 8 2 0.001500 m

************************** Runoff Quantity Continuity ************************** Total Precipitation ...... Evaporation Loss ......... Infiltration Loss ........ Surface Runoff ........... Final Storage ............ Continuity Error (%) .....

Volume hectare-m --------9.335 0.000 3.070 6.173 0.097 -0.052

Depth mm ------126.491 0.000 41.601 83.648 1.308

************************** Flow Routing Continuity ************************** Dry Weather Inflow ....... Wet Weather Inflow ....... Groundwater Inflow ....... RDII Inflow .............. External Inflow .......... External Outflow ......... Flooding Loss ............ Evaporation Loss ......... Exfiltration Loss ........ Initial Stored Volume .... Final Stored Volume ...... Continuity Error (%) .....

Volume hectare-m --------0.000 6.172 0.000 0.000 0.000 6.986 0.000 0.000 0.000 0.773 0.000 -0.582

Volume 10^6 ltr --------0.000 61.723 0.000 0.000 0.000 69.856 0.000 0.000 0.000 7.729 0.001

************************* Highest Continuity Errors ************************* Node East_Forebay (-1.25%)

*************************** Time-Step Critical Elements *************************** Link C8 (6.64%) Link C7 (5.83%) Link C9 (1.20%)

******************************** Highest Flow Instability Indexes ******************************** All links are stable.

1.35 0.60 0.60

1 1 1

4.46 2.59 1.95

************************* Routing Time Step Summary ************************* Minimum Time Step Average Time Step Maximum Time Step Percent in Steady State Average Iterations per Step Percent Not Converging

: : : : : :

0.50 sec 4.75 sec 5.00 sec 0.00 2.00 0.00

*************************** Subcatchment Runoff Summary *************************** -------------------------------------------------------------------------------------------------------Total Total Total Total Total Total Peak Runoff Precip Runon Evap Infil Runoff Runoff Runoff Coeff Subcatchment mm mm mm mm mm 10^6 ltr CMS -------------------------------------------------------------------------------------------------------S1 126.49 0.00 0.00 42.69 82.47 2.03 0.47 0.652 S2 126.49 0.00 0.00 54.89 70.35 4.96 0.45 0.556 S3 126.49 0.00 0.00 54.89 70.35 5.57 0.50 0.556 S4 126.49 0.00 0.00 38.11 87.14 24.06 2.30 0.689 S5 126.49 0.00 0.00 37.94 87.32 25.11 2.76 0.690

****************** Node Depth Summary ****************** --------------------------------------------------------------------------------Average Maximum Maximum Time of Max Reported Depth Depth HGL Occurrence Max Depth Node Type Meters Meters Meters days hr:min Meters --------------------------------------------------------------------------------J1 JUNCTION 0.06 0.72 208.72 0 08:34 0.72 J2 JUNCTION 0.08 0.83 205.00 0 08:54 0.83 J3 JUNCTION 0.04 0.46 198.46 0 08:57 0.46 J4 JUNCTION 0.04 0.41 198.41 0 09:00 0.41 J5 JUNCTION 0.08 0.76 202.36 0 08:58 0.76 J6 JUNCTION 0.06 0.65 208.65 0 08:38 0.65 J7 JUNCTION 0.11 1.06 191.41 0 00:00 0.86 OF1 OUTFALL 0.11 0.86 191.06 0 10:12 0.86 East_Forebay STORAGE 0.13 2.48 195.48 0 09:53 2.48 SWM_Pond STORAGE 0.23 2.84 193.84 0 10:12 2.84 West_Forebay STORAGE 0.06 1.59 196.09 0 09:23 1.59

******************* Node Inflow Summary ******************* ------------------------------------------------------------------------------------------------Maximum Maximum Lateral Total Flow Lateral Total Time of Max Inflow Inflow Balance Inflow Inflow Occurrence Volume Volume Error Node Type CMS CMS days hr:min 10^6 ltr 10^6 ltr Percent ------------------------------------------------------------------------------------------------J1 JUNCTION 2.762 2.762 0 08:40 25.1 25.1 -0.261 J2 JUNCTION 0.500 3.377 0 08:37 5.57 30.7 0.132 J3 JUNCTION 0.000 3.081 0 08:54 0 30.7 0.045 J4 JUNCTION 0.000 2.616 0 08:58 0 29 0.016 J5 JUNCTION 0.446 2.818 0 08:40 4.96 29.1 0.272 J6 JUNCTION 2.302 2.302 0 08:45 24.1 24.1 -0.355 J7 JUNCTION 0.000 3.298 0 10:12 0 69.9 0.002 OF1 OUTFALL 0.000 3.298 0 10:12 0 69.9 0.000 East_Forebay STORAGE 0.000 3.068 0 08:57 0 32.6 -1.238 SWM_Pond STORAGE 0.471 4.422 0 08:52 2.03 69.8 -0.030 West_Forebay STORAGE 0.000 2.614 0 09:00 0 29.2 -0.567

********************** Node Surcharge Summary ********************** No nodes were surcharged.

********************* Node Flooding Summary *********************

No nodes were flooded.

********************** Storage Volume Summary ********************** -------------------------------------------------------------------------------------------------Average Avg Evap Exfil Maximum Max Time of Max Maximum Volume Pcnt Pcnt Pcnt Volume Pcnt Occurrence Outflow Storage Unit 1000 m3 Full Loss Loss 1000 m3 Full days hr:min CMS -------------------------------------------------------------------------------------------------East_Forebay 0.112 2 0 0 2.746 38 0 09:53 1.925 SWM_Pond 0.592 4 0 0 8.499 57 0 10:12 3.298 West_Forebay 0.004 0 0 0 0.210 14 0 09:23 2.434

*********************** Outfall Loading Summary *********************** ----------------------------------------------------------Flow Avg Max Total Freq Flow Flow Volume Outfall Node Pcnt CMS CMS 10^6 ltr ----------------------------------------------------------OF1 67.22 0.400 3.298 69.856 ----------------------------------------------------------System 67.22 0.400 3.298 69.856

******************** Link Flow Summary ******************** ----------------------------------------------------------------------------Maximum Time of Max Maximum Max/ Max/ |Flow| Occurrence |Veloc| Full Full Link Type CMS days hr:min m/sec Flow Depth ----------------------------------------------------------------------------C1 CONDUIT 2.376 0 08:40 1.24 0.37 0.70 C2 CONDUIT 2.616 0 08:58 1.63 0.41 0.58 C3 CONDUIT 2.890 0 08:37 1.32 0.45 0.75 C4 CONDUIT 3.081 0 08:54 1.63 0.48 0.64 C5 CONDUIT 2.614 0 09:00 2.52 0.14 0.70 C6 CONDUIT 3.068 0 08:57 2.37 0.18 0.73 C7 CONDUIT 3.298 0 10:12 3.41 0.74 0.68 C8 CONDUIT 2.434 0 08:52 8.80 0.94 1.00 C9 CONDUIT 1.925 0 00:00 6.87 0.99 1.00 OR1 ORIFICE 3.298 0 10:12 1.00

*************************** Flow Classification Summary *************************** ------------------------------------------------------------------------------------Adjusted ---------- Fraction of Time in Flow Class ---------/Actual Up Down Sub Sup Up Down Norm Inlet Conduit Length Dry Dry Dry Crit Crit Crit Crit Ltd Ctrl ------------------------------------------------------------------------------------C1 1.00 0.02 0.00 0.00 0.98 0.00 0.00 0.00 0.96 0.00 C2 1.00 0.02 0.00 0.00 0.98 0.00 0.00 0.00 0.00 0.00 C3 1.00 0.02 0.25 0.00 0.73 0.00 0.00 0.00 0.97 0.00 C4 1.00 0.02 0.00 0.00 0.98 0.00 0.00 0.00 0.00 0.00 C5 1.00 0.00 0.02 0.00 0.77 0.20 0.00 0.00 0.61 0.00 C6 1.00 0.00 0.02 0.00 0.84 0.13 0.00 0.00 0.83 0.00 C7 1.00 0.00 0.00 0.00 0.60 0.40 0.00 0.00 0.83 0.00 C8 1.00 0.00 0.00 0.00 0.40 0.60 0.00 0.00 0.98 0.00 C9 1.00 0.00 0.00 0.00 0.41 0.59 0.00 0.00 0.97 0.00

************************* Conduit Surcharge Summary ************************* ---------------------------------------------------------------------------Hours Hours --------- Hours Full -------Above Full Capacity Conduit Both Ends Upstream Dnstream Normal Flow Limited ---------------------------------------------------------------------------C5 0.01 0.01 0.95 0.01 0.01 C6 0.01 0.01 2.65 0.01 0.01 C8 1.30 1.30 6.65 0.01 0.01 C9 3.36 3.36 6.65 0.01 0.01

Analysis begun on: Thu Jun 07 17:40:15 2018 Analysis ended on: Thu Jun 07 17:40:16 2018 Total elapsed time: 00:00:01

Appendix D MOECC Rough SWM Pond Sizing

GHD | Draft Surface Water Impact Assessment Technical Report| 11102771

OPTION 5

Page 1 of 2

MOE POND STORAGE REQUIREMENTS STORMWATER MANAGEMENT PLAN

Protection Level Wet Pond

Data Needed for Calculations Site Area

m2

741000

Storage Volume (m 3 /ha) for Impervious Level 35% 55% 70% 85%

Enhanced

140

190

225

250

Normal

90

110

130

150

Basic

60

75

85

95

2

Impervious

37050

m

Impervious

5%

%

Pond Size Requirement: Wet Pond

Protection Level

Storage Volume Requirement (m 3 )

Storage Volume (m 3 ) Requirement per ha Total

Permanent Pool Active Storage

Total

Permanent Pool Active Storage

Enhanced

65

25

40

4817

1853

2964

Normal

60

20

40

4446

1482

2964

Basic

38

-3

40

2779

-185

2964

Conclusion: The wet and dry volumes provided in the design meet MOE enhanced pond storage requirements.

CRA 078125 (3)

OPTION 5

Page 2 of 2

CHECK POND SIZING FOR APPROXIMATE PONDS USED IN MODEL

Existing Forebay (drains SW landfill) Elevation (m) 194.50 195.00 196.00 197.00 198.00 198.30

Depth (m) 0.00 0.50 1.50 2.50 3.50 3.80

Area (m 2 ) 26 77 244 487 820 936

Pond Volume Summary (of all 3 ponds) Volume (m 3) 0 38 365 1218 2871 3556

Permanent Pool (PP)

Top of Pond

Existing Detention Pond (to become new forebay that drains NW landfill) Elevation (m) 193.00 194.00 195.00 196.00 197.00 197.30

Depth (m) 0.00 1.00 2.00 3.00 4.00 4.30

Area (m 2 ) 513 949 1493 2173 2987 3243

Volume (m 3) 0 949 2987 6518 11947 13945

Permanent Pool (PP)

Volume (m 3) 0 2698 6909 12267 17946 20201

Permanent Pool (PP)

Top of Pond

Modified Pond (to be new Detention Pond) Elevation 191.00 192.00 193.00 194.00 195.00 195.30

CRA 078125 (3)

Depth 0.00 1.00 2.00 3.00 4.00 4.30

Area (m 2 ) 1923 2698 3455 4089 4486 4698

Top of Pond

Total Permanent Pool Total Active Storage Total Pond Volume

Required Volume (m3) 1,853 2,964 4,817

Model Volume (m3) 10,261 27,441 37,702