Chapter
Apr 26, 2012
Field Determination of Manning's n Value for Shrubs and Woody Vegetation
Authors: Gary E. Freeman, Ronald R. Copeland, William Rahmeyer, and David L. DerrickAuthor Affiliations
Publication: Engineering Approaches to Ecosystem Restoration
Abstract
A new method has been developed for the determination of Manning's n and hydraulic roughness values for shrubs and woody vegetation. This method involves the measurement of horizontal plant density, stem diameter, and the height and width of the leaf mass of a typical plant. Investigation has shown that the force value necessary for the calculation of plant stiffness modulus (Es) is linearly related to the stem area of a plant and varies from one plant variety to another. An simple example of the calculation of Manning's n values using the method is presented.
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© 1998 American Society of Civil Engineers.
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Published online: Apr 26, 2012
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Gary E. Freeman
President, River Research and Design, Inc. 4541 N. Windsor Dr. Provo, UT 84604
Ronald R. Copeland
Research Hydraulic Engineer, U.S. Army Waterways Experiment Station, 3909 Halls Ferry Rd. Vicksburg, MS 39180
William Rahmeyer
Professor, Civil and Environmental Engineering Dept., Utah State University, Logan, UT 84322-8200
David L. Derrick
Research Hydraulic Engineer, U.S. Army Waterways Experiment Station, 3909 Halls Ferry Rd. Vicksburg, MS 39180
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