TECHNICAL NOTES
Mar 1, 2001
Design Aid for Grass-Lined Channels
Authors: A. Osman Akan and Willi H. HagerAuthor Affiliations
Publication: Journal of Hydraulic Engineering
Volume 127, Issue 3
Abstract
The Manning roughness factor varies with the hydraulic radius in grass-lined channels. The functional relationship between the roughness factor and the hydraulic radius is highly nonlinear. This necessitates a lengthy and tedious trial-and-error method to solve the Manning formula in the different stages of the traditional design procedures for grass-lined channels. Various charts are presented in this technical note that can be used in designing grass-lined channels without a need for trial-and-error. The charts were developed using predetermined solutions to the Manning formula. They are presented in terms of dimensionless parameters and can be employed with any consistent unit system. The use of the charts is demonstrated through an example.
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References
1.
Chen, Y. H., and Cotton, G. K. ( 1988). “Design of roadsite channels with flexible linings.” Hydr. Engrg. Circular No. 15, Federal Highway Administration, Washington, D.C.
2.
Chow, V. T. ( 1959). Open channel hydraulics, McGraw-Hill, New York.
3.
French, H. R. ( 1985). Open channel hydraulics, McGraw-Hill, New York.
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History
Received: Jun 7, 1999
Published online: Mar 1, 2001
Published in print: Mar 2001
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Authors
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A. Osman Akan
Willi H. Hager
Fellow, ASCE
Fellow, ASCE
Prof., Dept. of Civ. and Envir. Engrg., Old Dominion Univ., Norfolk, VA 23529. E-mail: [email protected]
Prof., VAW, ETH-tentum, CH 8092, Zurich, Switzerland. E-mail: [email protected]
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