Nonuniform Sprinkler Irrigation Application Efficiency

by Fazal H. Chaudhry, (M.ASCE), Prof. and Head; Dept. of Hydraulics and Sanitary Engrg., Escola de Engenharia de Sao Carlos, Universidade de Sao Paulo, Sao Carlos, Brazil,

Serial Information: Journal of the Irrigation and Drainage Division, 1978, Vol. 104, Issue 2, Pg. 165-178

Document Type: Journal Paper


Universal relationships between application efficiency, statistical properties of water distribution pattern, and the application ratio are developed assuming that the application depths observe gamma distribution when asymmetrically distributed and normal in the symmetric case. Results for the positively skewed gamma distribution and the normal distribution are extrapolated to treat the negatively skewed applications. These relationships agree with those obtained numerically by other authors from observed distribution patterns. Application efficiency is shown to increase with positive asymmetry for minimum application depths equal to or less than the average depth. Negative asymmetry and larger applications have the oppositive effect on application efficiency. The results are presented in standard units that permit ready evaluation of application efficiency and other parameters for various irrigation systems having different uniformity characteristics.

Subject Headings: Asymmetry | Sprinkler irrigation | Gamma function | Skewness | Irrigation systems | Parameters (statistics) | Water conservation | Numerical methods

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