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Depressional Storage on Tilled Soil Surfaces

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Transactions of the ASAE. 27 (3): 0729-0732. (doi: 10.13031/2013.32861) @1984
Authors:   C. A. Onstad
Keywords:   

ABSTRACT DEPRESSIONAL storage volumes were calculated from microrelief data for over 1000 plots. Equations were developed relating depressional storage volume and surface area of the filled depressions to slope steepness and random roughness. It was found that runoff begins before depressional storage is completely satisfied. As a result, the amount of precipitation excess needed to fill depressions is larger than the depressional volume. A relation was developed for that quantity of precipitation excess as related to slope steepness and random roughness. Data are shown also demonstrating the effect of slope steepness and random roughness on the fraction of the soil surface contributing to runoff as a function of the fraction of precipitation excess needed to satisfy depressional storage.

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