American Society of Civil Engineers

Woody Debris Influence on Flow Resistance

by Steven R. Abt, (Prof., Dept. of Civil Engrg., Colo. State. Univ., Ft. Collins, CO 80523), Syndi J. Dudley, (Dir., Wtr. Res. Sec., Louis Berger & Assoc., Inc., Las Vegas, NV, 89119), and J. C. Fischenich, (Res. Engr., Env. Lab., USAE WES, Vicksburg, MS, 39180)
Section: Impacts of Vegetation on Flow and Sedimentation, pp. 42-47, (doi:

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Document type: Conference Proceeding Paper
Part of: Engineering Approaches to Ecosystem Restoration
Abstract: A study was conducted to assess the influence of woody debris on the resistance to flow that may be expected in small, third, and/or fourth order stream channels. A stream site was identified that had naturally matured with growth and debris. Flows were conveyed through the channel, with and without debris, and manning’s n values were determined. The results indicated that the resistance to flow with debris increased nearly 40% over the no debris condition.

ASCE Subject Headings:
Channel flow
Flow resistance
Stream channels