ABSTRACT:
Terraces usually reduce sheet and rill erosion between terraces and trap part of the eroded soil by deposition. The benefit of this deposition in reducing soil deterioration from erosion depends upon both the amount of deposition and terrace spacing. To determine P-factor values for terraces, field data were analyzed to derive an equation for deposition, as affected by terrace grade, that can be combined with a relationship for benefit from deposition. These values are used in conservation planning as part of the universal soil loss equation to estimate the reduction in soil loss produced by terraces.
Footnotes
G. R. Foster is a hydraulic engineer with the Agricultural Research Service, U.S. Department of Agriculture, and an associate professor in the Agricultural Engineering Department, Purdue University, West Lafayette, Indiana 47907. R. E. Highfill is a national agricultural engineer with the Soil Conservation Service, U.S. Department of Agriculture, Washington, D.C. 20013. This article is a contribution from the National Soil Erosion Laboratory, ARS, USDA, West Lafayette, Indiana, and SCS, USDA, Washington, D.C., in cooperation with the Purdue University Agricultural Experiment Station, West Lafayette, Indiana. Purdue Journal No. 9021.
- Copyright 1983 by the Soil and Water Conservation Society
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