Average Annual Soil Erosion by Water on Cultivated Cropland as a Proportion of the Tolerable Rate-1997
Source: Natural Resources Conservation Service
Map Description:
This map shows the 1997 actual soil erosion due to water as a proportion of the tolerable rate (T) for each 8-digit hydrologic unit. Four legend categories show areas that are less than the tolerable rate, from one to two times the tolerable rate, two to four times the tolerable rate, and four or more times tolerable rate. Actual soil erosion rate is determined using the Universal Soil Loss Equation (USLE). This map excludes areas where cultivated cropland is less than 5% of the total surface area. Areas with 95% or more Federal area are shaded gray.

Cautions for this Product:
NRI maps reflect national patterns rather than site-specific information. This map does not show total erosion. Data are not collected on Federal land. Data are not available for Alaska or the Pacific Basin. Data for Puerto Rico and the U.S. Virgin Islands are aggregated by 6- digit hydrologic unit.

For Further Information: