SLAMM Workshop Rochester, NY August 15 and 16, 2001 3) Controls for Stormwater

Challenges in Green Infrastructure Design and Associated Failure Modes, or how to get the most out of planned stormwater controlsRobert Pitt, Ph.D., P.E., D.WRE, BCEEDepartment of Civil, Construction, and Environmental EngineeringUniversity of AlabamaTuscaloosa, AL, USA 35487

1Dozen Issues of ConcernPoor AssumptionsCloggingCompactionChemical BreakthroughSodium Adsorption RatioImproper Sizing and LocationsGroundwater Interactions

Improper ConstructionPoor MaintenanceAnaerobic ConditionsLarge Underdrains and Short-CircuitingNeed Combinations of Controls and Unit Processes1) Real Data May Not Support Traditional Urban Hydrology Assumptions Many agencies and stormwater managers focus on single design storms that do not adequately represent the long-term discharges of water and pollutants during wet weatherLegacy of drainage design approachesSeattle Rains: