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Excessive addition of nutrients to Iowa surface waters from nonpoint and point sources impairs our waters for beneficial uses, and it also affects down-stream users. Gulf Hypoxia, eutrophication, harmful algal

Non-point source pollution due to agricultural activities is a vital issue for the State of Iowa. This project will provide a first assessment of the overall impact of a large

Animal production systems are becoming larger, and the public is concerned about the impacts of large animal facilities on water quality. Of particular concern are losses of nitrogen (N) in

Concern about the impact of ethanol production on Iowas water resources has increased due to the large increase in statewide ethanol production. Water use at ethanol plants could soon reach

Interest in biorenewable energy is increasing due to concerns associated with continued reliance on fossil fuels. As the primary producer of crops used as feedstocks for ethanol production and other

Improved watershed modeling, uncertainty analysis and statistical techniques for TMDLs have been identified as immediate TMDL science needs by the National Research Council (US EPA 2002). Recently approved sediment TMDLs

The quality and quantity of groundwater resources in Iowa are a growing concern because of increased pressures on quantity and concerns about contamination. Interactions between land management, groundwater, and surface

Excess sediment, phosphorus (P) and nitrogen (N) impair the majority of Iowa lakes and many streams also are impaired during some periods of the year. Most sediment and nutrients originate

Surface water from the Des Moines River is impaired by nitrate-nitrogen for drinking water use. Saylorville Reservoir is a 24.1 km2 impoundment of the Des Moines River located approximately 10

Runoff from open beef feedlots is a contributor of nutrients to the surface waters of Iowa. Currently, efforts are underway to improve the runoff control systems on open feedlot operations