Experimental Study of the Hydraulic Properties of Low-Pressure Drip Irrigation System

In this study, Hydraulic properties of low pressure drip irrigation systems were studied under laboratory conditions and using of the pipes that exist in Iran. Therefore, effect of various heads from 0.45 to 1.8m was evaluated for lateral pipe with outside diameter 32mm and length of 16, 30, 60 and also the lateral pipe with length 16 and outside diameter of 16, 20, 25 and 32mm, on hydraulic characteristics consist of average emitter discharge, variation coefficient, uniformity and loss. Emitters used in this study were micro-tube with length of 0.7m and outside diameter of 3mm that inserted to the lateral at 1m intervals. Results showed low pressure trickle irrigation system supplied necessary discharge in all of the lateral length and diameters to the end of it. Moreover, examine effect of lateral length and diameter on emitter coefficient uniformity indicated that desirable uniformity obtain in the lateral with length of 89m and outside diameter of 16mm and also the least head.