The Optimal Design for Sprinkle and Micro Irrigation Main Pipe Net
ZHU De-lan1, 2, WU Pu-te1, 2
1.College of Resources and Environment, Northwest Sci-tech University of A &F, 2.National Engine Research Center of WaterSaving-irrigation for Yang-Ling, Shanxi 712100, China
Abstract：Sprinkle and micro irrigation main pipe net with pressure was designed by two grades optimalmethod. Annual cost was used as objective function and successive diameter and pressure of pump was used asdecision variation. A nonlinear programming is established and solved by Lagrange method. A series of successiveoptimal diameter are obtained. On the base of the first optimal diameter, some shopping diameters are selectedaccording to the number of diameter variation of operational requirement. The diameter and length are used asdecision variation to obtain minimum annual cost. A linear programming is established and solved byDanChunXing method. Then water pressure of every dot along to main pipe was computed. By using themethod, not only is minimum annual coat obtained, but also is operational requirement satisfied. A designexample is displayed. The result showed that no specialist could use the design program, which is based onVisual-Basic language, conveniently and it is suitable for any pressure main pipe net design.
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