Sandcalculators Septversion

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Developed by the Center for Watershed Protection, the Watershed Treatment Model (WTM) is a simple spreadsheet model that tracks pollutant sources and the effectiveness of various watershed treatment options in urban and urbanizing watersheds. A wide range of treatment options, including green infrastructure practices, are contained in the WTM (e.g., impervious cover disconnection, riparian buffers, ponds, wetlands, swales and filters). The WTM can be used to develop TMDLs for nutrients or sediment; direct bacteria detective work in urbanized watersheds; determine the effectiveness of watershed education programs; and target the future program in a Phase II community. Specific outputs of the WTM include total loads of sediment, nutrients and bacteria from a given watershed. The WTM is currently being revised to provide estimates of runoff reduction associated with various watershed treatment options. www.cwp.org

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