A study of water Distribution Uniformity of Micro-irrigation Subunit [electronic resource].

Includes references.

The uniformity of micro irrigation system was influenced by the total amount of water required for plant on the field. The relationships between subunit uniformity and allowable pressure variation, filed topography, geometry, water temperature and pipe cost per unit area were studied. In this study a micro irrigation subunit was designed over practic:1i ranges of parameters and then to evaluate the uniformity of emitter discharges. To ach1e",e this goal, a simple design procedure was developed for hydraulic analyses and uniformity evaluation. The approximations used in this model were the reduction coefficient factor and the friction loss ratio to estimate the friction losses in the piping system. Another computer simulation model called Back Step Method was developed to verify and evaluate the design procedure as well as the approximation used by it. The golden section search technique was used to find the optimal values of pressure along both lateral and manifold. The results indicated that the design model is simple, accurate and fast. Different methods of quantifying micro irrigation subunit uniformity were coqipared. The programmable procedure of both the design and evaluation models were, presented. The study indicated that lateral length and slope have greater effect on subunit uniformity than manifold length and slope. The water temperature has no influence on subunit water uniformity.

Summary in Arabic.

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