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Development and Application of Watershed Models



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Watershed Management And Modeling Development and Application of Watershed Models for Simulation and Management of Nonpoint Source Pollutants Charles W Downer Coastal and Hydraulic Laboratory Billy E Johnson Environmental Laboratory Engineer Research and Development Center Watershed Management And Modeling Non point Source Pollution According to the US EPA non point source pollution NPSP Comes from many diffuse sources Caused by rainfall or snowmelt moving over and through the ground As the runoff moves it picks up and carries away natural and humanmade pollutants finally depositing them into lakes rivers wetlands coastal waters and even our underground sources of drinking water These pollutants include Excess fertilizers herbicides and insecticides from agricultural lands and residential areas Oil grease and toxic chemicals from urban runoff and energy production Sediment from improperly managed construction sites crop and forest lands and eroding streambanks Salt from irrigation practices and acid drainage from abandoned mines Bacteria and nutrients from livestock pet wastes and faulty septic systems Watershed Management and Modeling Extent of Problem In it s 2004 Water Quality Inventory Report to Congress the USEPA reported A large portion of the nations water bodies do not meet water quality standards 44 river miles 64 ponds lakes and reservoirs 30 of estuauries Water quality impairment attributed to NPSP constitutes a large percentage of the impaired water bodies 65 of river miles 30 of ponds lakes and reservoirs 40 of estuaries Watershed Management And Modeling Sources of Non Point Source Pollution Urban development Agriculture Land disturbance Construction Military training Timber harvest Fire Natural causes Watershed Management And Modeling Programs Related to Control of NPSP TMDL Process Total Maximum Daily Loading Intended to allow states to meet water quality standards The total loading that will allow water quality standards to be met for a given body of



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