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AGricultural Non-Point Source Pollution Model (AGNPS) is a joint USDA - Agricultural Research Service (ARS) and - Natural Resources Conservation Service system of computer models developed to predict non point source pollutant loadings within agricultural watersheds. It contains a continuous simulation surface runoff model designed to assist with determining BMPs, the setting of TMDLs, and for risk & cost/benefit analyses. 

The set of computer programs consist of: (1) input generation & editing as well as associated databases; (2) the "annualized" science & technology pollutant loading model for agricultural-related watersheds (AnnAGNPS); (3) output reformatting & analysis;  and (4) the integration of more comprehensive routines (CCHE1D) for the stream network processes;  (5) a stream corridor model (CONCEPTS);   (6) an instream water temperature model (SNTEMP); and (7) several related salmonid models (SIDO, Fry Emergence, Salmonid Total Life Stage, & Salmonid Economics). Not all of the models are electronically linked but there are paths of common input/output that, with the use of standard text editors, can be linked.

Summaries of the capabilities of the components of AGNPS are provided through the menu links on the index page.  More detailed descriptions of the components, with example datasets, and the programs can be found at the AGNPS download page.

Many individuals have cooperated in the development of AGNPS and they can be found in the Personnel section under the Project Team.  Many users have also registered as Cooperators who are using the model or working with AGNPS and are provided support by the AGNPS team.  Users are invited to register at the download page where individuals can see others that are using the model that might be a basis for further cooperation.

The AGNPS Web Site is maintained by the USDA - ARS
National Sedimentation Laboratory