Designing Trickle Irrigation Laterals for Uniformity

by Terry A. Howell, Res. Assoc.; Dept. of Agric. Engrg., Texas A&M Univ., College Station, TX,
Edward A. Hiler, Prof. and Head.; Dept. of Agric. Engrg., Texas A&M Univ., College Station, TX,

Serial Information: Journal of the Irrigation and Drainage Division, 1974, Vol. 100, Issue 4, Pg. 443-454

Document Type: Journal Paper


Design equations are derived that can be utilized to calculate the maximum lateral length for a given value of the uniformity coefficient. The solution depends upon the emitter flow function, elevation change, pipe size, reduction coefficient for dividing flow, pipe roughness coefficient, the average emitter flow rate, and either the average emitter spacing or the number of emitters per lateral. For a given uniformity the solution is a linear log-log line with a slope that depends only on the flow rate exponent in the pipe friction loss equation. Dimensionless graphs are presented that can be used to design trickle irrigation laterals. Two application examples are presented to demonstrate the design method and show its versatility.

Subject Headings: Pipe flow | Pipelines | Hydraulic design | Trickle irrigation | Flow rates | Hydraulic roughness | Spacing | Linear functions

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