Abstract
A method was developed for designing microirrigation submain units using the lateral flow rate equation, finite element method, and golden section search. Characteristics of water application uniformity affected by lateral parameters (length and diameter) and submain parameters (length and diameter) were analyzed using computer simulations. The design principle was then implemented based on the simulation results. When the required average emitter discharge, the required water application uniformity, one lateral parameter (length or diameter), and one submain parameter (length or diameter) are given, the optimal values of another lateral parameter, another submain parameter, best submain position (paired laterals), and operating pressure head can be accurately designed using a personal computer. A submain unit designed using this method has a minimal initial cost. This method is suitable for both submain units with uniform lateral lengths (in regular fields) and nonuniform lateral lengths (in irregular fields).
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