Approximating Friction Factors for Trickle Tubing

by James C. Bezdek, Assist. Prof.; Mathematics Dept., Utah State University, Logan, Utah,
Ken Solomon, Agricultural Irrigation Analyst; Rain Bird Technical Services, Logan, Utah,

Serial Information: Journal of the Irrigation and Drainage Division, 1978, Vol. 104, Issue 4, Pg. 351-359

Document Type: Journal Paper


A continuous functional form is identified which can represent explicitly the observed relationships between Reynolds number and friction factor for trickle irrigation tubing. Two methods are examined for determining a specific function of the chosen form from empirical data: a numerical analytic technique based on least-squared errors and Newton's method and an interactive computer graphics technique. The proposed methods are illustrated using data for a common type and size of trickle irrigation tubing.

Subject Headings: Friction | Trickle irrigation | Reynolds number | Empirical equations | Numerical analysis | Least squares method | Errors (statistics) | Computer analysis

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