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| Effect of emitters manufacturing variation of micro-irrigation on uniformity and lateral cost |
| Zhu Delan1, Wu Pute 1,2, Wang Jian1 |
| （1.China Arid area Water saving Agricultural Institute, Northwest Agriculture and Forestry University, Yangling, Shaanxi 712100, China; 2.College of Resources and Environment，Northwest Agriculture and Forestry University， Yangling, Shaanxi 712100, China) |
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Abstract In order to find the relationship among the emitter manufacturing variation coefficient, the lateralcost and the lateral diameter, and to decrease the cost of drip irrigation engineering the allowable values of the emitters manufacturing variation coefficient are analyzed for different emission uniformity coefficients(EEU). Then, the relationship among the esmitters manufacturing variation coefficient, lateral diameter,and the EEUis investigated.The function of the lateral cost is also parameterized.An application illustration shows that the pipe cost increases by 8.7％ and 37.1％ when the emitters manufacturing variationcoefficients increase from 0.05 to 0.07 and 0.11, respectively, for the lateral length of 100 m and EEUof 0.80. When the EEUincreases from 0.80 to 0.85, 0.90 and 0.95, the lateral diameter increasesby 20％,23.5％ and 56.5％ and lateral cost increases by 20％,53.8％ and 207.7％, respectively, for the emitters manufacturing variation coefficient of 0.03. For the emitters manufacturing variation coefficient of 0.05, when EEUincreases from 0.80 to 0.85, 0.90, the lateral diameter increases by 19.3％ and 32.8％, and lateral cost increased by 17.1％ and 71.4％, respectively. In addition, when the EEUis 0.95, the hydraulic calculation cannot be performed, because the allowable hydraulic variation is negative. It is concluded that the lateral diameter and cost increase significantly with increasingthe emitters manufacturing variation coefficient and the given uniformity coefficient. Furthermore, when the emitters manufacturing variation coefficient or the emission uniformity coefficient is larger than a preset value, the hydraulic design can not be carried out.
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Received: 08 January 2010
Published: 30 March 2011
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