precision ag tools, GIS

USDANAL. Water and Agriculture Information Center.

Searches for article citations in the NAL catalog (AGRICOLA) on modeling and water resources including hydrologic models for watersheds.

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."