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Design of Grass-Lined Channels: Procedure and Software Update

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

Citation:  Paper number  032099,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.13779) @2003
Authors:   Darrel M. Temple, Kevin R. Cook, Mitchell L. Neilsen, Sathish K. R. Yenna
Keywords:   Grass-Lined Channel, Waterway, Vegetated Channel, Open Channel Flow

The allowable erosionally effective stress design procedures of Agricultural Handbook #667 are widely used for design of grassed waterways and other grass-lined channels. However, the design aids, including computational software, provided in that publication have become outdated. It has also been observed that for trapezoidal channels with flat bank slopes, direct application of the traditional n-VR curves results in over-sensitivity of flow resistance to changes in bank slope at flow depths near vegetal overtopping. The nature of the transition from unsubmerged to submerged flow conditions in these channels is discussed and software using a computational procedure that appropriately accounts for this action is presented.

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