![]() We would like to show you a description here but the site won’t allow us. Version 5.1.011 with Low Impact Development (LID) Controls • • • • • • • • Description EPA's Storm Water Management Model (SWMM) is used throughout the world for planning, analysis and design related to stormwater runoff, combined and sanitary sewers, and other drainage systems in urban areas. There are many applications for drainage systems in non-urban areas as well. SWMM is a dynamic hydrology-hydraulic water quality simulation model. It is used for single event or long-term (continuous) simulation of runoff quantity and quality from primarily urban areas. The runoff component operates on a collection of sub catchment areas that receive precipitation and generate runoff and pollutant loads. The routing portion transports this runoff through a system of pipes, channels, storage/treatment devices, pumps, and regulators. SWMM tracks the quantity and quality of runoff made within each sub catchment. It tracks the flow rate, flow depth, and quality of water in each pipe and channel during a simulation period made up of multiple time steps. SWMM 5 has recently been extended to model the hydrologic performance of specific types of low impact development (LID) controls. The LID controls that the user can choose include the following seven green infrastructure practices: • Permeable pavement • Rain gardens • Green roofs • Street planters • Rain barrels • Infiltration trenches • Vegetative swales The updated model allows engineers and planners to accurately represent any combination of LID controls within a study area to determine their effectiveness in managing stormwater and combined sewer overflows. Running under Windows, SWMM 5 provides an integrated environment for editing study area input data; running hydrologic, hydraulic and water quality simulations; and viewing the results in a variety of formats. The latter includes • color-coded drainage area and conveyance system maps, • time series graphs and tables, • profile plots, and • statistical frequency analyses. SWMM 5 was produced in a joint development effort with CDM, Inc., a global consulting, engineering, construction, and operations firm. Capabilities SWMM accounts for various hydrologic processes that produce runoff from urban areas. These include • time-varying rainfall, • evaporation of standing surface water, • snow accumulation and melting, • rainfall interception from depression storage, • infiltration of rainfall into unsaturated soil layers, • percolation of infiltrated water into groundwater layers, • interflow between groundwater and the drainage system, • nonlinear reservoir routing of overland flow, and • runoff reduction via LID controls. Spatial variability in all of these processes is achieved by dividing a study area into a collection of smaller, homogeneous sub catchment areas. Each of the areas contains its own fraction of pervious and impervious sub-areas. Overland flow can be routed between sub-areas, between sub-catchments, or between entry points of a drainage system. SWMM contains a flexible set of hydraulic modeling capabilities used to route runoff and external inflows through the drainage system network of pipes, channels, storage/treatment units and diversion structures.
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