Friction Factors for Corrugated Plastic Tubing

by Lee F. Hermsmeier, Agric. Engr.; Southwestern Irrig. Field Station, Brawley, CA,
Lyman S. Willardson, (M.ASCE), Res. Investigations Leader; Southwester Irrig. Field Station, Brawley, CA,

Serial Information: Journal of the Irrigation and Drainage Division, 1970, Vol. 96, Issue 3, Pg. 265-271

Document Type: Journal Paper


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.

Subject Headings: Plastics | Friction | Plastic design | Material tests | Drainage | Irrigation | Field tests | Irrigation water | California

Services: Buy this book/Buy this article


Return to search