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Accession number;03A0178552
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| Title;Irrigation Efficiency in a Rotation Block of Sprinkler Irrigation Systems. |
| Author;
AN'YOJI HISAO
(National Inst. Rural Engineering)
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Journal Title;Transactions of the Japanese Society of Irrigation, Drainage and Reclamation Engineering
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Journal Code:S0345A
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ISSN:0387-2335
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VOL.;NO.223;PAGE.127-132(2003)
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| Figure&Table&Reference;FIG.1, TBL.1, REF.7 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;A comprehensive approach to design of sprinkler irrigation systems is to treat a rotation block as one unit. Water utilization efficiency of a designed rotation block should be evaluated, but an evaluation method was not developed yet. The rotation block is now designed with two different criteria. A spacing between sprinklers is determined to achieve an acceptable value of water distribution efficiency on a surface covered by four sprinklers. Lateral and submain lines are designed to achieve an acceptable discharge variation from sprinklers in the rotation block. The coefficient of variation in statistic terms is one of measures to appraise the water distribution efficiency. The coefficient of variation has been related to the Christiansen's uniformity coefficient and the pattern efficiency. The coefficient of variation has also been related to the apllication and storage efficiencies. In this paper, the coefficient of variation of water on the surface covered by four sprinklers will be related to the discharge variation from sprinklers in the rotation block. (author abst.) |
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