Hydraulic Analysis of Microirrigation Submain Units

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Abstract
A simple method was developed for hydraulic analysis of a microirrigation submain unit. The lateral discharge equation is used to express the relationship between the inlet discharge and the inlet pressure head of a lateral. This equation allows for considering a submain as a lateral and a lateral as an emitter. The back step method was applied for calculating pressure distribution along the submain line. The golden section search was used to find the optimal estimate of pressure head at the end of the submain. The forward step method was used for determining distributions of the pressure head and the emitter discharge along each lateral. A flowchart for calculation on a personal computer is included. It was found that any microirrigation submain unit can be analyzed using this method. The analytical procedure is simple, accurate, and fast.

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