Testing of agricultural sprinklers is necessary to find the optimum field operating conditions with minimum cost while satisfying design water distribution criteria. In the present study two twin-nozzle agricultural sprinklers were tested in field under ten different operating pressures ranging from kg/cm² to kg/cm². In each experiment sprinkler discharge rate, nozzle pressure, radius of throw, and water distribution pattern around the sprinkler were observed. The average discharge coefficients of the two sprinkler nozzles were determined. The radius of throw was measured in four orthogonal directions. The distortions in radius of throw were observed to study the effect of wind on water distribution patterns. The depth distribution profiles across the wetted area did not show significant distortions for wind velocities less than 2 m/s. The experimental results obtained for the sprinkler heads showed that the discharge from the sprinkler nozzle increased with the increase in the nozzle pressure. Under identical pressure head the discharge rate of the sprinkler with larger nozzle size was more. Empirical pressure-discharge relationships were developed for the two sprinkler heads. | Testing of twin-nozzle agricultural sprinklers for field use
