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STORM WATER MANAGEMENT MODEL QUALITY ASSURANCE REPORT: DYNAMIC WAVE FLOW ROUTING
Citation:
ROSSMAN, L. A. STORM WATER MANAGEMENT MODEL QUALITY ASSURANCE REPORT: DYNAMIC WAVE FLOW ROUTING. U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-06/097, 2006.
Impact/Purpose:
To inform the public
Description:
The Storm Water Management Model (SWMM) is a computer-based tool for simulating storm water runoff quantity and quality from primarily urban areas. In 2002 the U.S. Environmental Protection Agency’s Water Supply and Water Resources Division partnered with the consulting firm CDM to develop a completely re-written version of SWMM, version 5.0. The most numerically challenging sub-model to implement within SWMM 5 was the dynamic wave flow routing routine formerly known as Extran (for Extended Transport). This report documents the Quality Assurance testing program that was used to compare the dynamic wave flow routing procedures of SWMM 5 with those of the earlier SWMM version 4. Comparisons were made on 20 different drainage network models of varying size and complexity. For the most part the time histories of flows and water depths produced by SWMM 5 closely matched those of SWMM 4. However, SWWM 5 was generally able to produce stable solutions using a much higher routing time step than SWMM 4 and also executed slightly faster. Overall, the Quality Assurance testing conducted in this study indicates that the updated SWMM 5 program performs dynamic wave flow routing as good as or better than SWMM 4.