A Model Relating Water and Sediment Yield to Upstream Agricultural Practicesby J. Garbrecht, USDA, Fort Collins, CO, USA,
D. G. DeCoursey, USDA, Fort Collins, CO, USA,
Abstract: 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: Sediment | Hydrologic models | Rivers and streams | Irrigation water | Water conservation | Water yield | Land use | Agricultural wastes | Aquatic habitats | Soil water | North America | United States | Washington | South Carolina
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