stormwater modeling tools - glisa.umich.eduglisa.umich.edu/media/files/stormwater modeling...
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Source: USEPA
http://www.washingtonnature.org
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• Stormwater Management Model (SWMM)
• National Stormwater Calculator (SWC)
• Driven by the SWMM model, the SWC focuses primarily on the estimate of annual rainfall and above-ground stormwater runoff.
• User supplies information about site’s land cover, plus the potential application of low-impact development control practices to reduce stormwater runoff at the modeled site.
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• For planning, analysis, and design related to stormwaterrunoff
• Local storm water system can be modeled explicitly and with great detail
• Simulates single or long-term scenarios
Sub-catchmentAreas
UndergroundStormwater
Conduits
Rain GaugeOutlet
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• SWMM accounts for various hydrologic processes that produce runoff from urban areas:
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Low impact development (LID) controls
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• Free, though can be costly to truly utilize
• Example: City of Ann Arbor
• Hired a consulting firm to help with customization and implementation of the model
• Purchased equipment to monitor flow and calibrate the model
• Compared model output with measured flow
• Calibrated the modeling system
• Cost of project was on the order of $1-2 million!
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• National Stormwater Calculator (NSC)
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