Evaluation of the Impact of Best Management Practices on Streamflow, Sediment and Nutrient Yield at Field and Watershed Scales

Abstract Evaluating Best Management Practices (BMPs) in watersheds using hydrologic and water quality models can help to establish an effective watershed management. Soil Water Assessment Tool (SWAT) was applied Big Sunflower River Watershed (BSRW) the Stovall Sherard (SSW) evaluate BMP’s impact at field scale respectively. SWAT calibrated validated for streamflow, sediment yield, total nitrogen (TN), phosphorous (TP) outlets of three sub-basins BSRW, within SSW. BMP scenarios check-dam, tail pond, vegetative filter strips (VFS), nutrient management, tillage management were evaluated their efficacy reducing loads scales. The VFS determined as most decreasing TN, TP both At scale, reduction by ranged from 8 12%, 71% 98%, 72% 99% respectively 12 38%, 29% 87%, 42% application conservation zero operation showed yield 1% 2% but increased TN 25% watersheds. This study will managing regarding BMPs selection implementation. Graphical