A Model Relating Water and Sediment Yield to Upstream Agricultural Practices

by J. Garbrecht, USDA, Fort Collins, CO, USA,
D. G. DeCoursey, USDA, Fort Collins, CO, USA,

Document Type: Proceeding Paper

Part of: Water Forum '86: World Water Issues in Evolution


A physical-process model is formulated to quantify daily water and sediment yield as related to upstream land use, land management, and soil and water conservation measures. This model is applied in a computer program which assesses the quality of the instream aquatic habitat and the survival of salmonid in the Tucannon River Basin, WA (Garbrecht et al, 1986a). The model consists of three major components which are surface runoff, groundwater, and sediment yield. The SCS curve number, the crop management factor, and the conservation practice factor are parameters used in the model. These parameters vary with land use and agricultural management practices, and they form the link between the upstream agricultural practices and the downstream discharge and sediment concentration in the Tucannon River. The individual model components, their interdependence, and their link to agricultural practices are presented.

Subject Headings: Water conservation | Hydrologic models | Water yield | Sediment | Rivers and streams | Irrigation water | Soil water | Computer models | Alabama | South Carolina | Washington | United States

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