Introduction: Effects of LID on an urban stormwater management system
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This document discusses a study analyzing the effects of low impact development (LID) techniques on an urban stormwater management system in Windsor City using EPA-SWMM 2005 software. It provides background on increased runoff from urbanization and climate change impacts. The study will model an existing stormwater sewer system, apply LID measures like bio-retention and porous pavement, and compare flow rates and runoff volumes with and without LID to evaluate their stormwater management benefits.
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Introduction: Effects of LID on an urban stormwater management system
- 1. EFFECTS OF ‘LID’ ON AN URBAN STORMWATER MANAGEMENT SYSTEM AAKASH BAGCHI (104296114) 87-590-06 : CLIMATE CHANGE ADAPTATION FOR ENGINEERS OF WINDSOR CITY, USING EPA-SWMM 2005
- 2. INTRODUCTION • IN ITS NATURAL STATE, STORMWATER INFILTRATES INTO GROUND OR GOES BACK INTO ATMOSPHERE BY EVAPORATION/TRANSPIRATION • URBAN DEVELOPMENT CAUSES MORE AND MORE IMPERVIOUS AREA • RESULT IS ‘RUNOFF’
- 3. PRE AND POST DEVELOPMENT HYDROGRAPH (PRE- URBANIZATION) HYDROGRAPH (POST- URBANIZATION) Lag time
- 4. CLIMATE CHANGE • INTENSE PRECIPITATION • FOLLOWED BY LONGER DRY SPELLS
- 5. EFFECTS OF EXCESS RUNOFF • SOIL EROSION • CONSEQUENTLY, SILTING OF STREAM BEDS • FLOODS • EXCESS POLLUTANTS IN STREAMS, AS MICRO- ORGANISMS RESIDING IN THE SOIL ARE NOT ABLE TO BREAK DOWN POLLUTANTS INTO NUTRIENTS Grand River dischargi ng sediment s into Lake Michigan Effects of Soil Erosion
- 6. AN EFFICIENT STORMWATER MANAGEMENT SYSTEM EFFICIENT STORMWATER MANAGEMENT SYSTEM = LOT-LEVEL CONTROLS + CONVEYANCE CONTROLS + END-OF-PIPE CONTROLS Maintain the Hydrologic Cycle Flood and Erosion Control
- 7. SUSTAINABLE STORMWATER MANAGEMENT PRACTICES • USE OF PARTLY PERVIOUS PAVING MATERIALS LIKE GRASSCRETE OR PERVIOUS PAVEMENT • STORING OF THE STORMWATER FROM THE ROOF IN STORAGE TANKS • ROOF GARDENS • PERMEABLE WALKWAYS
- 8. LOW-IMPACT DEVELOPMENT • LID IS A STORMWATER MANAGEMENT STRATEGY THAT SEEKS TO MITIGATE THE IMPACTS OF INCREASED RUNOFF AND STORMWATER POLLUTION BY MANAGING RUNOFF AS CLOSE TO ITS SOURCE AS POSSIBLE. (CREDIT VALLEY CA, 2010) • LID CONTROLS IN SWMM: • BIO-RETENTION • INFILTRATION TRENCH • POROUS PAVEMENT • RAIN BARREL • VEGETATIVE SWALE
- 9. METHOD OF ANALYSIS SWMM modelling of existing Stormwater Sewer system Calibration/ Validation of model Modelling for scenario, after applying LID measures Future Weather data sourced from IDF curves Historical Weather Data LID measures applied to model Flow data
- 10. IDF CURVES FOR FUTURE DATA Example of IDF curves for future scenarios downloaded from http://www.idf-cc-uwo.ca/.
- 11. STUDY AREA • ST1200 • LAST MANHOLE : 8R3577 ST1200
- 12. EXPECTED RESULTS • LID IS EXPECTED TO REDUCE PEAK FLOW RATES IN STORMWATER PIPES • LID IS EXPECTED TO REDUCE TOTAL RUNOFF VOLUME FROM THE SEWERSHED
- 13. THANK YOU