Watershed-Scale Simulation of Sediment and Nutrient Loads in Georgia Coastal Plain Streams using the Annualized AGNPS Model

Sediment and nutrient loadings in the Little River watershed in south central Georgia were modeled using the continuous simulation annualized Agricultural Nonpoint Source Pollution (AGNPS) model. Specifically, nitrogen, phosphorus, sediment and runoff were predicted over a seven-year period. Land under cultivation makes up approximately 25% of the 333-km2 watershed. Livestock facilities are predominantly swine, dairy cows and beef cattle. Results from the simulation were compared to 7 years of monitoring data in 6 locations of varying drainage areas throughout the watershed.