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Channel Erosion Estimate for Urbanizing Watersheds: Submerged Jet testing and SWAT DEG

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

Citation:  21st Century Watershed Technology: Improving Water Quality and Environment Conference Proceedings, 21-24 February 2010, Universidad EARTH, Costa Rica  701P0210cd.(doi:10.13031/2013.29391)
Authors:   Peter M Allen, Jeff G Arnold, Stephanie Capello, Dave Coffman
Keywords:   Keywords SWAT, urbanization, degradation, SWAT-DEG tool, Submerged Jet Test

The Soil Water Assessment Tool (SWAT) has been modified to simulate downcutting and widening on small alluvial and threshold streams. An erodibility coefficient from submerged jet testing is multiplied by tractive force to compute downcutting and the channel slope is adjusted accordingly. Widening of the channel is accomplished through local width-depth ratios derived from measurements of streams in the area. Modeled results indicate the temporal change in down cutting and channel adjustment, useful in project planning and channel assessment. The variables for this tool have been kept to the minimum. Modeled results indicate land use and erodibility coefficients are more important than basin size in regulating degradation in small urban basins .Downcutting follows hyperbolic trends and indicates most degradation is accomplished in this North Texas area in 30 years.

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