Design of microirrigation laterals on nonuniform slopes using the lateral discharge equation

摘要

A method was developed for designing microirrigation laterals on nonuniform slopes based on the required average emitter discharge and the required uniformity of water application. The lateral discharge equation is used to express the relationship between the pressure head and discharge at the inlet of a lateral in order to find the required operating pressure head of the lateral. The hydraulic analysis was performed using the back step and forward step methods. When the required average emitter discharge, the required uniformity of water application, and one parameter - either the length or diameter of a single lateral, are given, then the unknown parameter, the operating pressure head can be accurately designed using personal computers. The diameter, the best submain position and the operating pressure head of paired laterals can also be accurately designed. The design procedure was included.