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RiverSmart Washington Building Green Infrastructure to Reduce Stormwater Runoff

RiverSmart Washington Building Green Infrastructure to Reduce Stormwater Runoff. Concept Plan Review Meeting November 10. 2011. Concept Report. Background Design Objective Project Approach Design Metrics and Protocols Site Assessments and Modeling Site Design Recommendations

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RiverSmart Washington Building Green Infrastructure to Reduce Stormwater Runoff

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  1. RiverSmart WashingtonBuilding Green Infrastructure to Reduce Stormwater Runoff Concept Plan Review Meeting November 10. 2011

  2. Concept Report • Background • Design Objective • Project Approach • Design Metrics and Protocols • Site Assessments and Modeling • Site Design Recommendations • Cost Effective Volume Reduction • Community Enhancement

  3. Background Illustration of intersection Importance of 1.2” Rainfall Event • Compliance with the Municipal Separate Storm Sewer (MS4) Permit • 90th percentile of all storm events that occur within a given year • Reduce the volume of stormwater that contributes to Combined Sewer Overflows • Verification of the Green Buildout Model (LimnoTech, 2006) Webster St & Iowa Ave

  4. Design Objective Iowa Ave & Webster St Implement green infrastructure and LID across the sewer shed in public lands • Quantify stormwater volume reductions as predicted in the GBOM • Determine effectiveness • Recommend the maximum extent practicable of LID implementation

  5. Project Approach • Develop planning and design metrics and protocols • Select and develop the use of Representative Green Infrastructure Technologies • Bioretention cells • Permeable pavement • Cisterns • Green roofs • Vegetated swales • Develop monitoring strategy • Demonstration & Educational Value • Mayor’s Sustainability initiative

  6. Modeling • Retention Volume Method (RVM) • Used to generate the runoff volume that would result from the 1.2 inch storm event based on land use • Runoff Reduction Method (RRM) • Used to generate the runoff volume that would result from the 1.2 inch storm event based on land cover • Storm Water Management Model (SWMM) • Used for single event storms and continuous simulation modeling of runoff over a representative one-year period • Used to determine the individual aggregate effectiveness of the LID practices

  7. MacFarland MS (CSO)

  8. MacFarland Model Results RV Model Results RRM Model Results

  9. MacFarland Model Results SWMM Model Continuous Simulation Results Wet Weather Flow to the collection system predicted by SWMM in the downstream pipe

  10. Effectiveness & Efficiency Effectiveness per Subshed Efficiency per LID Type

  11. Constraints Constraints • Geometric Constraints • Utility conflict limits the depth of the BMP • Geotechnical – Infiltration Rates • Alleys • Numerous basements • Utility Poles • MacFarland Middle School Site • Maintenance • Areas of high sediment and trash loads would affect the performance of the BMP

  12. MacFarland – Geometric Considerations

  13. Alley Constraints

  14. MacFarland School

  15. Lafayette Site Lafayette (MS4)

  16. Lafayette Model Results RV Model Results RRM Model Results

  17. Lafayette Model Results SWMM Model Continuous Simulation Results The results predict an overall runoff retention of 68% from all BMPs. At the in-pipe metering location the reduction in overall flow is 67%

  18. Effectiveness & Efficiency Effectiveness per Subshed Efficiency per LID Type

  19. Lafayette – Geometric Consideration

  20. Lafayette – Geometric Consideration

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