University of Khartoum

Center Pivot Irrigation Systems: Appropriate Selection, Assembling and Nozzle Programming

Center Pivot Irrigation Systems: Appropriate Selection, Assembling and Nozzle Programming

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Title: Center Pivot Irrigation Systems: Appropriate Selection, Assembling and Nozzle Programming
Author: Alhassan, Omar Abdel Aziz Mohammed
Abstract: This study was conducted during the period June 2013 to June 2016 at Hassad farm of the Central Trading Company (CTC) which is located at Km 111north Omdurman 17Km west of Omdurman – Dongola main road. Fifteen Zimmatic center pivot systems were selected of the American Lindsay company. Each system would cover a cultivated area of 120 feddan. Out of these pivots, seven pivots each was composed of seven towers of equal length of 54.6m, but with two different pipe internal diameters, The first four were of pipe diameter 21.91cm (18 5/8") where as the other three had pipe diameter 16.83cm (6 5/8"), An overhang 27m in length and pipe diameter 12.7cm (5"),attached to each one of the pivots The other eight pivots each had eight towers with no overhang and divided in two groups of four having similar specifications as the previous two groups. Regarding the pivot assembling, two different procedures were followed for twelve pivots in which each tower was erected separately, then towed and linked with the other towers. For the other three pivots, the towers of each pivot were linked together on the ground then assembled as one unit without any towing. Thus saving time, labor and money as compared to the first procedure. Similarly in nozzle programming, two procedures were followed. For twelve pivots the conventional manufacturing chart was applied, however in this method, the manufacturing company needs to be contacted directly or indirectly through the dealer in case of failure or checking programming are required, this will cost time and money. Hence to save such substantial costs, another method was followed in situ. The nozzle particulars as provided by the manufacturing company would be inserted in special computer program and when applied on the other three pivots gave very satisfactory results compared to those of the company. Performance evaluations were done for all pivots based on ASAE Standard S436-1 and satisfactory results were obtained for the coefficient of uniformity (Cu) applying Christiansen (1942) and Heerman-Hein (1968) equations and for the distribution of uniformity (Du), the application efficiency (Ea) and the scheduling uniformity (Su). Hence it is recommended to adopt such nozzle programming as it is simple, cheap and can easily be applicable in situ.
Description: 72 Pages
URI: http://khartoumspace.uofk.edu/123456789/24158


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