Economic and Predictive Reliability Implications of Stormwater Design Methodologies

摘要

Seven alternative analytical methodologies for drainage design and hydrologic analyses are compared: rational method, synthetic unit hydrograph method, SCS peak discharge method, SCS tabular hydrograph method, regression equations, modeling with synthetic design storms, continuous simulation with historic storms, and USGS flood frequency methods. Modeling is accomplished using the EPA Storm Water Management Model (SWMM). The SWMM model was calibrated on each catchment and then run continuously for the number of years of hourly data available from the National Weather Service (22-38 years). The SWMM Statistics Block was then used to rank storm runoff volumes and storm runoff peaks in order to perform a frequency analysis on these two parameters.