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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/9192

Title: Uniformities of water application along the pivot lateral and the lateral path for six center pivot systems were measured under field conditions to evaluate the performance of these systems. The effect of the machine travel speed on uniformity was also investigated. The results have indicated that high uniformity occurred along the travel path, while low uniformity occurred along the travel. That non-uniformity along the lateral was found to be related to the movement of the towers and wind speed. Results also have shown that travel speed influences the Cu values.
Authors: ., A.I. Al Amoud
F.S. Mohammad
Issue Date: 1993
Abstract: The problem of a lateral pipe with equally spaced emitters and uniform slope is investigated. Individual emitters are considered in discharge and pressure estimations along the lateral. The friction head loss between successive emitters is estimated by the Darcy-Weisbach formula, taking into account the variation of the Reynolds number, the different zones on Moody diagram, and the friction coef-ficient formula corresponding to each zone. In addition, the change of the velocity head is accounted for at different emitters. As the net pressure head at each emitter is evaluated, the corresponding emitter discharge is estimated accordingly. A com¬puter program is presented for analyzing and designing trickle-irrigation laterals. The results of two numerical examples solved using the presented technique are in close agreement with those of other rational analysis. Laminar flow prevails in a considerable length at the downstream end of the lateral, whereas an upstream length may be subject to fully turbulent flow. The estimation of the lower-quarter distribution uniformity shows that considering individual emitters rather than lon-gitudinal slot is of practical importance. Design criteria for trickle-irrigation laterals are provided
URI: http://hdl.handle.net/123456789/9192
Appears in Collections:College of Foods And Agricultural Science

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