Phosphorus, nitrogen and other nutrients can be transported from agricultural land by surface runoff and subsurface leaching to surface freshwater bodies. Management activities on cultivated land in high rainfall areas may pose risk to water quality. Research Scientists in the National Soil Survey Center developed a technique utilizes existing climatic, hydrologic, and soil survey databases to estimate the loss of nutrients by runoff and leaching from agricultural land (SSI Report No.52). The NRCS technique applies runoff and percolation models to estimate water loss from agricultural watersheds. The GIS software which utilizes available spatial soil and land cover layers as well as the predicted data for water and nutrient losses, can be applied to develop digital maps. These maps improve data presentation and communications with the clientele as well as identify trouble areas within a watershed.