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Technical Guidelines for Stormwater Management (SWM ...

If you require content in an alternate format please contact us at 905-895-1281 or by email at LSRCA Technical Guidelines for Stormwater Management Submissions Approval Date: June 24, 2016 Effective Date: September 1, 2016 ii TABLE OF CONTENTS INTRODUCTION .. 1 Environmental Planning and Stormwater Management .. 2 Stormwater Management .. 3 Stormwater Management Requirements .. 5 Stormwater Quantity control .. 7 Peak Flow control .. 7 Volume control .. 7 Stormwater Volume control Requirements .. 7 Flexible Treatment Alternative for Sites with Restrictions.

community and their consultants regarding the stormwater management (SWM) and Erosion / Sediment Control requirements of the Lake Simcoe Region Conservation Authority (LSRCA) in ... controlling runoff volume and mimicking natural hydrology treatment methods including, capture and re-use, using a wide variety of stormwater management (SWM) and ...

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  Control, Methods, Erosion, Sediment, Sediment control

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Transcription of Technical Guidelines for Stormwater Management (SWM ...

1 If you require content in an alternate format please contact us at 905-895-1281 or by email at LSRCA Technical Guidelines for Stormwater Management Submissions Approval Date: June 24, 2016 Effective Date: September 1, 2016 ii TABLE OF CONTENTS INTRODUCTION .. 1 Environmental Planning and Stormwater Management .. 2 Stormwater Management .. 3 Stormwater Management Requirements .. 5 Stormwater Quantity control .. 7 Peak Flow control .. 7 Volume control .. 7 Stormwater Volume control Requirements .. 7 Flexible Treatment Alternative for Sites with Restrictions.

2 8 Major-Minor System Conveyance .. 10 Regulatory Storm Conveyance .. 10 Stormwater Quality control .. 11 Suspended Solids .. 11 Phosphorus .. 11 Winter Salt .. 12 Temperature .. 12 Other Contaminants .. 13 Oil, Grease and Gas .. 13 Heavy Metals .. 14 Stream erosion control .. 14 Water Balance/Groundwater Recharge .. 14 erosion and sediment control .. 16 Soil erosion .. 16 erosion control Requirements .. 17 MODELLING and Stormwater Management (SWM) FACILITY DESIGN .. 18 Hydrologic Analysis.

3 18 Hydraulic Analysis .. 19 Stormwater Management (SWM) Facility Design .. 19 Lot Level and Conveyance Controls or Low Impact Development (LID) .. 19 Design Requirements .. 20 Parking Lot Storage and Rooftop 23 Manufactured Treatment Devices (MTDs) .. 24 Oil/Grit Separators .. 24 Filtration Devices .. 25 Maintenance Requirements .. 25 Stormwater Management Report Submission .. 26 Stage 1 and 2 Reports .. 26 Re-Submission .. 27 Climate Change .. 27 GLOSSARY .. 29 REFERENCES .. 31 iii APPENDICES APPENDIX A Stormwater Management (SWM)

4 REPORT MINIMUM REQUIREMENTS APPENDIX B PEAK FLOW control CREDITS INFILTRATION SYSTEMS APPENDIX C TYPICAL HYDROLOGIC VALUES AND REFERENCES APPENDIX D MANUFACTURED TREATMENT DEVICES APPENDIX E PHOSPHORUS LOADING APPENDIX F CRITERIA FOR STREAM erosion control STUDY APPENDIX G erosion AND sediment control MINIMUM REQUIREMENTS APPENDIX H MINIMUM PLANTING REQUIREMENTS APPENDIX I TYPICAL HYDRAULIC VALUES AND REFERENCES APPENDIX J IMPLEMENTATION Guidelines FIG. 17 APPENDIX K MINIMUM REQUIREMENTS FOR ENGINEERING SUBMISSIONS.

5 FLOODPLAIN MAPPING, SURVEY AND GEOSPATIAL DATA iv NOMENCLATURE 1D One Dimensional 2D Two Dimensional 3D Three Dimensional AES Canadian Atmospheric Environment Services AMC Antecedent Moisture Conditions BMP(s) Best Management Practice(s) Certified Engineering Technologist CAD AutoCAD Software Program CD Compact Disc CHI Computational Hydraulics Incorporated cm Centimetre CN Curve Number CN* Modified Curve Number CVC Credit Valley Conservation DTM Digital Terrain Model DVD Digital Video Disc EC Consolidated frequency analysis EIS Environmental Impact Study EOP End of Pipe EPA Environmental Protection Agency ESC erosion and sediment control etc.

6 Etcetra Et al And others ETV Environmental Technology Verification FSR Functional Servicing Report Geo-X Stream Modelling Software GIS Geographic Information System ha Hectare HEC2 Army Corps of Engineering Hydraulic Modelling Software HEC-RAS Army Corps of Engineering Hydraulic Modelling Software hr Hour HSG Hydrologic Soil Group HY-8 Federal Highway Administration Hydraulic Modelling Software HYMO Hydrologic Modelling Software For example Ia initial Abstraction ICD Inlet control Device ID Identification IDF Intensity Duration Frequency IF Infiltration Facility In/hr inches per hour kg/ha/yr Kilogram per hectare per year km2 Square Kilometre LID Low Impact Development LIDAR Light Detection and Ranging Survey Technology LNAPL Light Non-Aqueous Phase Liquid LSEMS Lake Simoce Environmental Management Strategy LSPP Lake Simcoe Protection Plan v LSRCA Lake Simcoe Region Conservation Authority m Metres m asl Elevation in metres above sea level m2 Square

7 Metres m3 Cubic Metres m3/ha Cubic Metres per Hectare m3/s Cubic Metres per second mm/h Millimeter per hour Manning s n Roughness Coefficient MDP Master Drainage Plan MESP Master Environmental Servicing Plan mm Millimetre MMAH Ministry of Municipal Affairs and Housing MNR Minitry of Natural Resources MNRF Ministry of Natural Resources and Forestry MOE Ministry of the Environment MOECC Ministry of the Environment and Climate Change MOI Ministry of Infrastructure MPCA Minnesota Pollution control Agency MSP Master Servicing Plan MTDs Manufactured Treatment Devices MTO Ministry of Transporation NAD North American Datum NASHYD Rural Catchment Modelling Routine NJDEP New Jersey Department of Environmental Protection O&M Operation and Maintenance Ontario Regulation OCCS Ontario Climate Change Strategy OGS Oil Grit Separator OLS Ontario Land Surveyor ORMCP Oak Ridges Moraine Conservation Plan OTTHYMO HYMO Based Hydrologic Modelling Software P.

8 Eng. Professional Engineer Professional Geoscientist PCSWMM SWMM5 Based CHI Modelling Suite PPS Provincial Policy Statement Right of Way SCS United States Natural Resource Conservation Service formerly Soil Conservation Service SGBLS South Georgian Bay Lake Simcoe Statues of Ontario SP Secondary Plan SPMDD Standard Proctor Maximum Dry Density SPP Source Protection Plan Square Feet STANDHYD Urban Catchment Modelling Routine SWM Stormwater Management SWMM5 EPA SWM Modelling Software Tc

9 Time of Concentration TIMP Total Impervious Area vi TIN Geospatial Surface Tp Time to Peak TRCA Toronto and Region Conservation Authority TSS Total Suspended Solids United States UTM Universal Transverse Mercator VO Visual OTTHYMO Software Suite VO2, VO3, etc. WHPA Wellhead Protection Area XIMP Directly Connected Impervious Area 1 INTRODUCTION The Lake Simcoe Region Conservation Authority s mission is to work with our community to protect and restore the Lake Simcoe watershed by leading research, policy and action.

10 A key component of this is to ensure development is done in an environmentally friendly and sustainable manner. One of the ways this is achieved is through development review. Development review can include the need for the following: (a) Watershed or Sub-watershed Plan and Master Environmental Servicing Plan; (b) Planting or Vegetation Plan, Vegetation Preservation Plan; (c) Watercourse and/or Valley Wall Stabilization Plan; (d) Slope stability- erosion study; (e) Environmental Impact Study (Hydrogeological and or Ecological EIS); (f) Stormwater Management Report; (g) erosion / sediment control Plan; (h) Floodplain Study; (i) Dynamic Shoreline Study.


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