Research Article
Sep 1970
Friction Factors for Corrugated Plastic Tubing
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VIEW THE REPLYPublication: Journal of the Irrigation and Drainage Division
Volume 96, Issue 3
Abstract
Hydraulic tests on corrugated plastic drain tubing were conducted at the Southwestern Irrigation Field Station of the Agricultural Research Service, Brawley, CA. Manning&s n and Darcy-Weisback f were determined for commercially available tubing from 1.375 to 4-in. nominal diameter. An average design value of Manning's n of 0.016 is recommended for 2-in. through 3-in. diam. corrugated plastic tubing for grades over 0.001. For lower grades with these diameters an average design value of Manning's n of 0.017 is recommended. For corrugated plastic tubing less than 2 inches in diameter and average design value of Manning's n of 0.018 is recommended. Humps and depressional variations up to two diameters fro ma uniform grade do not increase head losses in full-flowing lines.
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Information & Authors
Information
Published In
Journal of the Irrigation and Drainage Division
Volume 96 • Issue 3 • September 1970
Pages: 265 - 271
Copyright
© 1970 American Society of Civil Engineers.
History
Published in print: Sep 1970
Published online: Feb 11, 2021
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Authors
Affiliations
Lee F. Hermsmeier
Agri. Engr., Southwestern Irrigation Field Station, Brawley, Calif
Lyman S. Willardson, M.ASCE
Res. Investigations Leader, Southwestern Irrigation Field Station, Brawley, Calif
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