USDA. NAL. Water and Agriculture Information Center.
Modeling
![precision ag tools, GIS](https://webarchive.library.unt.edu/web/20201219001506im_/https://www.nal.usda.gov/sites/default/files/styles/info-center-subject-pages/public/nrcsla12213.tif_.jpg?itok=79e-5Kq7)
DOI. United States Geological Survey.
A method for regional interpretation of water-quality monitoring data.
Environmental Protection Agency.
Provides information about the model and allows you to download it. You can also join the BASINS discussion list.
Environmental Protection Agency.
Environmental Protection Agency list of models for water research.
Colorado School of Mines.
"The IGWMC is an internationally oriented research, education, and information center for integrated groundwater modeling, hosted at the Colorado School of Mines. Our efforts focus on conducting research in practical, applied areas of groundwater hydrology and modeling, as well as engaging with our community through education and outreach initiatives."
Purdue University. College of Engineering.
"Designed to help people quantify the impact of land use change on the quantity and quality of their water. This tool uses the land use and a soil characteristic from the user along with thirty years of precipitation data to determine the average impact that a particular land use change or set of changes will have on both the annual runoff and the average amount of several non-point source pollutants." See also Short-term Runoff Tools that include SedSpec, an expert system for analyzing runoff and erosion problems, and a database of rainfall depths in the U.S.
U. S. Army Corps of Engineers and others.
"The Federal Support Toolbox is a comprehensive "one-stop-shop" online water resources data portal with direct links to valuable data, state of the art models and tools for utilization in information sharing and collaboration for the water resources community in the U.S. and internationally."
U.S. Environmental Protection Agency.
"Virtual Beach is a software package designed for developing site-specific statistical models for the prediction of pathogen indicator levels at recreational beaches."