The Shale Hills Catchment, located in central Pennsylvania, is approximately 8 h

Question

The Shale Hills Catchment, located in central Pennsylvania, is approximately 8 hectares in area and completely forested. The average hill slope is approximately 35% over 100 m distance. The soil has approximately 70% silt and fine sand, 5% sand, 3% organic matter, a fine granular structure, and moderate to rapid permeability. The canopy is composed of mature forest (estimate at 4 m high), much of the ground (80%) is covered with leaf duff. The remaining 20% of the ground can be considered bare. Given this combination, please use 0.021 for VM factor. Predict the average annual erosion using the Modified USLE.

Explanation / Answer

The equation is A = R x K x L x S x C x P

R factor is based on rainfall and runoff,

K is the soil erodibility factor and depends on the type of soil.

L and S factors are usually considered together and are measures of the length and steepness of a slope.

C factor, or crop management factor,

P factor, or support practice factor,

A = R x K x L x S x C x P

    = 0.21* 3*4*5*8*100

   arround average erosion anual rate = 22 %

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