抄録
Pressure and flow control devices are usually set at the head of each rotation block in an irrigation block. A comprehensive approach to the hydraulic design of sprinkler irrigation systems is to treat a lateral line and submain lines in the rotation block as one unit. A sprinkler discharge variation is theoretically related to pressure head variation. Equations of pressure head variations along the lateral and the submain lines are derived as a function of the pressure heads at the upstream end, downstream end, and average point for uniform slope situations. When the sprinkler discharge variation is set as a design criterion, an allowable pressure head variation for the rotation block can be calculated. The allowable pressure head variation for the rotation block is allocated to the lateral and submain lines. The lateral and submain lines can then be designed to meet the allocated values of the pressure head variation with a trial-and-error method. The developed design method is evaluated with a design example.
