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Prediction of Soil Cracking and the Effect on Surface Runoff in a Texas Blackland Prairie Watershed

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

Citation:  Pp. 57-60 in Preferential Flow, Water Movement and Chemical Transport in the Environment, Proc. 2 nd Int. Symp. (3-5 January 2001, Honolulu, Hawaii, USA), eds. D. D. Bosch and K. W. King. St. Joseph, Michigan: ASAE. , Pub. Date 3 January 2001  701P0006.(doi:10.13031/2013.2079)
Authors:   J.G. Arnold, K.N. Potter, P.M. Allen, K.W. King
Keywords:   Crack measurement, hydrologic model, surface runoff

Soil surface elevation changes were measured and soil crack volume calculated for a two-year period at the USDA-ARS Riesel Y-2 watershed in central Texas. Soil anchors were placed in triplicate at depths of 0.15, 0.45, 0.91, 1.52, and 2.44 m. A crack flow submodel was developed for this study and incorporated into SWAT, a comprehensive hydrologic model. The model computes crack volume from crack potential, soil depth and soil moisture. SWAT was run with and without the crack subroutine and in general, the model more accurately simulated the surface runoff process using the crack subroutine.

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