![]() ![]() SWMM INPUT FILE (*.INP)Like EPANET input file Length Roughness (Mannings coefficient) Offset22 ![]() SWMM INPUT: CONDUITSInlet node Outlet d O tl t node Shape (e.g., circular) Maximum depthDiameter for circular pipes SWMM INPUT: NODESNodes (manholes)Coordinates (can import from GIS) Inflow (cfs) Invert (bottom) elevation Maximum depth SWMM INPUT: SUBCATCHMENTSCoordinates (can import from GIS) Rain gauge (rainfall hyetograph) Outlet Area Width S ope Slope (%) Percent imperviousness Roughness Infiltration parameters18 INPUT DATA - HYDROLOGICPrecipitation Channel Characteristics Watershed characteristicsImperviousness Slope Roughness Width (a shape factor) Depression Storage Infiltration ParametersInfiltration parameters for either the Horton or Green-Ampt equations for up to 100 subcatchments.17 LIMITATIONS OF SWMMNot applicable to large-scale, non-urban watersheds Not applicable to forested areas or irrigated cropland Not suitable with highly aggregated (e.g., daily) rainfall data It s Its an analysis tool not an automated design tool, tool TYPICAL APPLICATIONS OF SWMMDesign and sizing of drainage system components including detention facilities Control f C t l of combined and sanitary sewer bi d d it overflows Generating non-point source (NPS) pollutant loadings for wasteload allocation studies Evaluating BMPs for sustainability goals Flood plain mapping of natural channel systems WATER QUALITY MODELING FEATURESPollutant buildup over different land uses Pollutant washoff during runoff events Reduction in buildup from street cleaning Reduction in washoff from Best Management P ti M t Practices (BMPs) (BMP ) Water quality routing through the drainage network User-defined treatment functions9 Models various flow regimes, such as backwater, surcharging, reverse flow, and surface ponding HYDRAULIC MODELING FEATURESModels drainage networks of any size Accommodates various conduit shapes as well as irregular natural channels Models pumps, regulators, storage basins Allows external inflows, For example:Rainfall Dependent Inflow and Infiltration (RDII) Dry Weather Flow (DWF) or sanitary flow HYDROLOGIC MODELING FEATURESSpatially and time varying rainfall Evaporation of standing surface water Snow accumulation and melting Interception from depression storage Infiltration into soil layers Nonlinear routing of overland flow WHAT IS SWMM?SWMM is a dynamic rainfall-runoff simulation model used for single event or long-term (continuous) simulation of runoff quantity and quality from primarily urban areas (sewersheds). WHAT IS SWMM? A hydrologic and hydraulic (H&H) and water quality model Models sanitary, combined, and storm sewers and their drainage areasHYDROLOGY Wet Weather Flow Quantity And Quality in Drainage Areas HYDRAULICS Flow and Quality Routing in Conduits OUTLINEDownload instructions Description Capabilities Applications User interface Input data Output O t t results lt Tutorial Exercise2 ![]() ![]() Adjunct Professor Department of Civil / Environmental & Chemical Engineering CEEN 4800/6965 - Special Topics Geographic Information Systems and Hydrologic & Hydraulic Modeling Sam Shamsi, Ph.D., P.E. ![]()
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