Thompson Creek Flood Study Report - City of Peterborough

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Thompson Creek Detailed Flood Reduction Study City of Peterborough Letter of Transmittal ACKNOWLEDGEMENTS TABLE OF CONTENTS 1.0 INTRODUCTION...............................................................................................................1 1.1 BACKGROUND .............................................................................................................1 1.2 CLASS ENVIRONMENTAL ASSESSMENT PROCESS .........................................................3 2.0 PHASE 1 – PROBLEM OR OPPORTUNITY.................................................................8 2.1 DEFINITION OF STUDY AREA .......................................................................................8 2.2 IDENTIFICATION OF THE PROBLEM ...............................................................................8 2.3 PROBLEM STATEMENT.................................................................................................8 3.0 PHASE 2 – EXISTING ENVIRONMENTAL CONDITIONS.....................................10 3.1 GENERAL...................................................................................................................10 3.2 SUMMARY OF AVAILABLE INFORMATION ..................................................................10 3.2.1 Previous Studies...........................................................................................10 3.2.2 Available Data and Data Gaps....................................................................13 3.3 NATURAL ENVIRONMENTAL RESOURCES...................................................................15 3.3.1 Fish Community and Fish Habitat...............................................................15 3.3.2 Terrestrial Features: Wetlands, Vegetation and Wildlife............................18 3.3.3 Fluvial Geomorphology...............................................................................23 3.3.4 Water Quantity Characteristics ...................................................................28 3.3.5 Water Quality Characteristics .....................................................................29 3.3.6 Surficial Soils/Geology/Hydrogeology ........................................................29 3.4 SOCIO-ECONOMIC ENVIRONMENT .............................................................................30 3.4.1 Existing Land Use........................................................................................30 3.4.2 Future Land Use ..........................................................................................34 3.5 SUMMARY OF EXISTING ENVIRONMENTAL CONDITIONS ............................................34 4.0 PHASE 2 – EXISTING CONDITIONS: FLOOD VULNERABILITY......................37 4.1 GENERAL...................................................................................................................37 4.2 SUMMARY OF AVAILABLE FLOOD RELATED INFORMATION .......................................37 4.2.1 Flood Reduction Master Plan......................................................................37 4.2.2 Existing Flood Plain Mapping.....................................................................39 4.2.3 Flow Monitoring ..........................................................................................39 4.3 EXISTING DRAINAGE/STORMWATER MANAGEMENT SYSTEM .....................................43 4.3.1 Thompson Creek Drainage Area .................................................................43 4.3.2 Local Drainage To Otonabee River.............................................................44 4.4 MODELLING CHARACTERISTICS OF MAJOR/MINOR SYSTEMS ....................................45 4.4.1 OTTHYMO Modelling of Thompson Creek Drainage Area ........................45 4.4.2 HEC-RAS Modelling of Thompson Creek....................................................49 4.4.3 OTTSWMM Modelling of Local Drainage Systems.....................................50 4.5 SIMULATION OF FLOOD VULNERABILITY DESIGN EVENTS.........................................54 4.5.1 Definition of Design Rainfalls .....................................................................54 4.5.2 Results of Thompson Creek Watercourse Simulations ................................58 4.5.3 Results of Local Drainage Systems Simulations..........................................65 14-06605-01-W01 City of Peterborough i
Thompson Creek Detailed Flood Reduction Study City of Peterborough 4.6 MAPPING OF FLOOD VULNERABLE LOCATIONS ...................................................73 4.6.1 Results for Thompson Creek Watercourse...................................................73 4.6.2 Results for Local Drainage Systems ............................................................75 4.7 FLOOD DAMAGE ESTIMATION .............................................................................88 4.7.1 Results for Thompson Creek Watercourse...................................................89 4.7.2 Results for Local Drainage Systems ............................................................89 4.8 SUMMARY OF FLOOD VULNERABILITY ................................................................91 5.0 PHASE 2 – EVALUATION OF FLOOD PROTECTION OPTIONS.........................93 5.1 CORNER OF SCOLLARD DRIVE (NEAR FRANCIS STEWART RD).............................93 5.2 NW CORNER ELDON COURT AND FRANCIS STEWART ROAD................................95 5.3 FRANMOR DRIVE,CHAPEL DRIVE, ABBEY LANE AREA ...................................95 5.4 ARMOUR ROAD SOUTH OF MOIR STREET.............................................................96 5.5 FLOOD PROTECTION RECOMMENDATIONS ....................................................97 LIST OF APPENDICES APPENDIX A.......................................................................................TERMS OF REFERENCE APPENDIX B...................................................DOCUMENTATION OF PUBLIC CONSULTATION APPENDIX C...........................................PHOTOGRAPHS OF THOMPSON CREEK WATERSHED APPENDIX D...................................................................................FISHERIES INFORMATION APPENDIX E............................................................ TERRESTRIAL FEATURES INFORMATION APPENDIX F .................................................................GEOMORPHOLOGICAL INFORMATION APPENDIX G ...........................................................FLOW &RAINFALL MONITORING DATA APPENDIX H ........................................................... OTTHYMO MODEL DOCUMENTATION APPENDIX I ...............................................................HEC-RAS MODEL DOCUMENTATION APPENDIX J ........................................................... OTTSWMM MODEL DOCUMENTATION APPENDIX K ....................................................................DESIGN RAINFALL INFORMATION LIST OF DRAWINGS DRAWING NO. ........................................................................................................ LOCATION SS-1 FV-1 FV-2A, B & C FV-3 STORM SEWER SYSTEM –THOMPSON CREEK STUDY AREA........................POCKET THOMPSON CRK FLOOD LINES – 100 YEAR,JULY 2004 & TIMMINS STORMS.......................................................................................POCKET THOMPSON CRK FLOOD LINES –VOLUME BASED STORMS ....................... POCKET THOMPSON CRK FLOOD LINES –THOMPSON CREEK DAM RELEASES ....... POCKET SF-1 EXTENT OF FLOODING –SCOLLARD DR.&ELDON CRT.– 100 YEAR &JULY 2004 STORMS ......................................................... POCKET SF-2 EXTENT OF FLOODING –FRANMOR DR.&MOIR ST.AREA – SF-3 100 YEAR &JULY 2004 STORMS ......................................................... POCKET EXTENT OF FLOODING –SCOLLARD DR.&ELDON CRT.– 40 MM &60 MM STORMS ...................................................................... POCKET SF-4 EXTENT OF FLOODING –FRANMOR DR.&MOIR ST.AREA – 40 MM &60 MM STORMS ......................................................................... POCKET 14-06605-01-W01 City of Peterborough ii
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AES Type 2 Duration = 6 hrs Return
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AES Type 2 Duration = 1 Duration Vo
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480 0.00 490 0.03 500 0.26 510 0.54
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1500 2.97 1510 2.43 1520 2.25 1530
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LEGEND EXISTING CATCHBASIN LOCATION
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Thompson Creek Flood Study Report - City of Peterborough

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