EVALUATION OF RAINGUN (PY-30) WITH 10 MM DIAMETER NOZZLE

Abstract

The raingun ( PY -30) with 10 mm diameter nozzle was operated under 13 different pressures ranging from 20 to 80 psi with an interval of 5 psi. Each set of data was replicated thrice. The water application rate, distribution pattern, discharge and radius of coverage were measured with pressure. The coefficients of uniformity of the raingun were determined in four quarter by dividing the radius of coverage into four equal parts and at effective radius of coverage. The values of coefficient of uniformity were higher ( 95.85% ) in the first quarter and lower (48.03%) in the fourth quarter. The discharge of the raingun was 21.40 gpm at 20 psi pressure and 39.31 gpm at 80 psi pressure. The discharge increased with the increase in pressure. The radius of coverage was found to be 20.5 m at 20 psi pressure and 24.5 m at 80 psi pressure. The radius of coverage increased with the increase in pressure but the increase in radius of coverage was not uniform and regular. The application rates of the raingum under various pressures were determined. The maximum application rate of 4.73 mm/hr was found at 80 psi pressure and the minimum application rate of 3.51 mm/hr was found at 30 psi pressure. A strong relationship was obtained between pressure and application rate.