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MODELING NON-DIRECTLY CONNECTED IMPERVIOUS AREAS IN DENSE NEIGHBORHOODS
Citation:
Huber, W. C. AND L. Cannon. MODELING NON-DIRECTLY CONNECTED IMPERVIOUS AREAS IN DENSE NEIGHBORHOODS. In Proceedings, Ninth International Conference on Urban Drainage, Portland, OR, September 08 - 13, 2002. American Society of Civil Engineers (ASCE), Reston, VA, NA, (2002).
Impact/Purpose:
To inform the public.
Description:
A dense residential neighborhood of 16.9 acres (6.8 ha) in Portland, OR experiences basement flooding problems and flow capacity problems in its combined sewers. Low impact development (LID) alternatives, such as disconnection of downspouts from roofs, are being explored by the City of Portland as one means of alleviating the problem. The USEPA's Storm Water Management Model was used to simulate runoff from the area under current conditions and under hypothetical LID conditions in which runoff from roofs and driveways is directed over adjacent pervious areas. Both an aggregated model representation (14 subcatchments, including 11 subcatchments representing house parcels) and a disaggregated model representation (118 subcatchments, including 115 subcatchments representing each house parcel) were studied. Predicted hydrographs compared well with the City of Portland Bureau of Environmental Services monitored flows for the neighborhood for both model representations. The hypothetical LID simulation resulted in over a 50% reduction in hydrograph peaks and volumes.
