Average Annual Soil Erosion by Wind and Water on Cropland and CRP Land - 1997
Source: Natural Resources Conservation Service - National Resources Inventory
Map Description:
This is a shaded polygon map where soil erosion by water on cropland and Conservation Reserve Program (CRP) land is displayed in five shaded classes of tons per acre per year using these ranges: Less than 1, 1 to 3, 3 to 5, 5 to 8, and 8 or more. The Universal Soil Loss Equation (USLE) is used to determine the values. The shaded polygons represent 8-digit hydrologic units. Areas where cropland and CRP land occupy less than 5% of the total area in 1997 are left blank. Areas with 95% or more federal lands are shaded gray. 40 million acres are eroding at a rate above 5 tons per acre per year due to water.

Cautions for this Product:
Erosion by water includes sheet and rill erosion and excludes gully erosion. Since cropland and CRP land may occupy only a small percentage of the total area of some of the polygons, the map may leave a misleading impression as to the significance of higher erosion rates in some areas where there is little cropland. Data are not collected on Federal land. Data are not available for Puerto Rico, Alaska,and the Pacific Basin.

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