Excessive Erosion on Cropland 1997
Source: Natural Resources Conservation Service - National Resources Inventory
Map Description:
This dot density map shows acres where excessive erosion from wind and water is occurring on cropland. Red dots represent 5,000 acres of highly erodible land eroding excessively (60.4 million acres). Yellow dots represent 5,000 acres of non-highly erodible land eroding excessively (51.6 million acres). Data are aggregated by 8-digit hydrologic units. Excessive erosion is defined as erosion greater than the tolerable rate (T). The Universal Soil Loss Equation (USLE) is used to calculate water erosion. The Wind Erosion Equation (WEQ) is used to calculate wind erosion. A total of 112 million acres are eroding excessively resulting in 1.3 billion tons of erosion. Areas with 95% or more federal lands are shaded gray. Excess erosion leads to water quality concerns from sediments, nutrients, and pesticides as well as air quality in wind erosion areas of the West, Midwest, Northern Plains, and Southern Plains. Excess erosion is also an indicator of forgone opportunities for improving soil, water, and air quality, sequestering carbon dioxide, and helping in goals to reduce greenhouse gases in the atmosphere.

Cautions for this Product:
Erosion by water includes sheet and rill erosion and excludes gully erosion. Within an 8-digit hydrologic unit, dot counts represent acreage totals correctly plus or minus one dot to account for remainders. This map does not show rates of erosion or how much erosion has occurred. Data are not collected on Federal land. Data are not available for Puerto Rico, Alaska, and the Pacific Basin.

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