Phosphorus Modeling in the Annualized Agricultural Nonpoint Source Pollution (AnnAGNPS) Model

Each day, AnnAGNPS simulates runoff, sediment, nutrients, and pesticides leaving the land surface and being transported through the watershed channel system to the watershed outlet before the next day is considered. The model routes the physical and chemical constituents from each cell into the stream network and finally to the watershed outlet and has the capability to identify the sources of pollutants at their origin and to track them as they move through the watershed system.