Analytical Equation for Variation of Discharge in Drip Irrigation Laterals
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VIEW THE REPLYPublication: Journal of Irrigation and Drainage Engineering
Volume 129, Issue 4
Abstract
Statistical uniformity of discharge variation is an important parameter in designing drip irrigation laterals. A simple analytical equation is derived to determine the coefficient of variation of discharge. This equation is used to determine the coefficient of variation of discharge for a numerical problem. The result is compared with the energy gradient line approach. Both the methods give the same result. For any required coefficient of variation of discharge, the diameter of a lateral can be designed directly for a known lateral length, slope, emitter discharge exponent, pressure head at the start of the lateral, and discharge rate through the lateral, by writing the analytical equation in quadratic form.
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References
Bralts, V. F., Edwards, D. M., and Wu, I. P. (1987). “Drip irrigation design and evaluation based on the statistical uniformity concept.” Advances in irrigation, Vol. 4. Academic, New York, 67–117.
Bralts, V. F., Wu, I. P., and Gitlin, H. M.(1981). “Manufacturing variation and drip irrigation and irrigation uniformity.” Trans. ASAE, 24, 113–119.
Kang, Y., Yuan, B., and Nishiyama, S.(1999). “Design of micro irrigation laterals at minimum cost.” Irrig. Sci., 28, 125–133.
Keller, J., and Karmeli, D.(1974). “Trickle irrigation design parameters.” Trans. ASAE, 17(4), 678–684.
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Wu, I. P., and Gitlin, H. M.(1975). “Energy gradient line for drip irrigation laterals.” J. Irrig. Drain. Eng., 101(4), 323–326.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 129 • Issue 4 • August 2003
Pages: 295 - 298
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: May 30, 2001
Accepted: Dec 4, 2002
Published online: Jul 15, 2003
Published in print: Aug 2003
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