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STORM WATER MANAGEMENT MODEL
Description:
Storm Water Management Model (SWMM) is a comprehensive model for analysis of quantity and quality problems associated with urban runoff. Both single-event and continuous simulation may be performed on catchments having storm sewers, combined sewers, and natural drainage, for prediction of flows, stages, and pollutant concentrations anywhere in the system. Dynamic flow routing equations (the St. Venant equations) are available for accurate simulation of backwater, looped connections, surcharging, and pressure flow. The model can be used to simulate all aspects of the urban hydrological and quality cycles, including rainfall, snowmelt, surface and subsurface runoff, flow routing through the drainage network, storage, and treatment. Statistical analyses may be performed on long-term precipitation data and on output from continuous simulation. Surface runoff quality is generated based on conceptual buildup-washoff relationships and/or rate curve relationships and by other optional mechanisms.