EPA’s Stormwater Management Model (SWMM) is a dynamic hydrologic/hydraulic water simulation model used for single event or long-term (continuous) simulation of runoff quantity and quality. The latest version, SWMM5, has been utilized throughout the world for planning, analysis and design related to stormwater runoff, combined and sanitary sewers, and other drainage systems in urban and non-urban areas.
PCSWMM is a decision support system for SWMM5 that is built around a powerful GIS engine to work seamlessly with the latest GIS data formats, and provides intelligent tools for streamlining model development, optimization and analysis in a comprehensive range of applications.
This workshop will provide an in-depth look at new green infrastructure and LID modelling capabilities in EPA SWMM5/PCSWMM including green roofs, bio-retention, permeable pavement, rain barrels, infiltration trenches, rain gardens, vegetative swales and rooftop disconnection.
Green infrastructure and LID facilities are becoming an increasingly popular complement to "end of pipe" solutions. LIDs are designed to intercept, store and/or infiltrate precipitation before runoff reaches the conveyance system. LIDs are becoming an integral part of new development design and are also being retrofit into existing developments in order to promote infiltration, reduce stormwater runoff and improve receiving water quality.
PCSWMM streamlines the modelling of LIDs on either a detailed, lot-level scale, or on a subwatershed or watershed scale for planning studies. The deterministic approach models physical processes within various LID control devices.
The benefits of using EPA SWMM5/PCSWMM for LID analysis include:
• Detailed, physically-based, lot-level LID design and evaluation
• Master planning type studies, with quick assignment of multiple LIDs and treatment areas
• Evaluate the long-term performance of LIDs with clogging (reduction of infiltration capacity)
• Comparison of the continuous hydrologic and water quality benefits of various LID implementations with scenario comparison tools
• Use of sensitivity-based radio tuning calibration (SRTC) tool to determine sensitivity of different LID practices and parameters under different conditions
• Determine effectiveness of LIDs for precipitation events of different types and timing using PCSWMM’s time series analysis/management tools (to evaluate reduction in peak runoff, total flow volume, pollutant load etc.)
• Analyze and compare results with flow-duration-exceedance curves, and more...