AGNPS: A Tool for Watershed Planning

by R. A. Young,
C. A. Onstad,

Document Type: Proceeding Paper

Part of: Watershed Planning and Analysis in Action


The AGNPS model was developed to provide a means of assessing water quality impacts from agricultural watersheds. AGNPS simulates sediment and nutrient transport from the headwaters to the outlet in a stepwise manner so that an assessment can be made at any point in the watershed. The basic model components are hydrology, erosion, sediment, and chemical transport. Point sources of sediment from gullies and inputs of water, sediment, nutrients, and COD from animal feedlots or other sources are also considered. The Minnesota Feedlot Model is incorporated as a subroutine into AGNPS. Water impoundments, such as tile-outlet terraces, are also considered as depositional areas of sediment and sediment associated nutrients. Two examples are presented showing how the AGNPS model has been used to pinpoint 'critical' areas of sediment and nutrient production in a watershed, and estimate the potential benefits of implementing best management practices to alleviate pollution problems.

Subject Headings: Watersheds | Hydrologic models | Water pollution | Nonpoint pollution | Sediment transport | Water quality | Quality control | Irrigation water | Minnesota | United States

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