The fertilizers data base summarized the relative fraction of Nitrogen and Phosphorous pool in the different fertilizers. Information on level of bacteria in manure is also stored in this record data base. SWAT allows several different subunits or objects to be defined within a watershed. SWAT directly models the loading of water, sediment and nutrients from land areas in a watershed. However, some watersheds will have loadings to the stream network from sources not associated with a land area. These are referred to as point sources. The most common point source is a sewage treatment plant. SWAT allows users to add daily or average daily loading data for point sources to the main channel network. These loadings are then routed through the channel network along with the loadings generated by the land areas
SWAT Model Description: The Soil and Water Assessment Tool (SWAT) model is a continuous, long-term, physically based semi-distributed model developed to assess impacts of climate and land management on hydrological processes, sediment loading, and pollution transport in watersheds