Design of Sprinkler System for Lawn and Landscape Irrgaton

Abstract

A study with the objective of designing an automated sprinkler irrigation system for lawns, as part of landscape area, was carried out at the Demonstration Farm of the Faculty of Agriculture, University of Khartoum, Shambat, during December 2003 to April 2005. The system was composed of two Hydro-zones (Watering zones). Pop-up sprayer heads were installed in Hydro-zone A, while pop-up rotary-sprinkler heads were installed in Hydro-zone B. The design was made with the aid of manufacturer’s catalogues and relevant site information. Two design-plans were considered, Plan I and Plan II, each of which had different sprinkler spacing. The system was designed and installed and the following parameters were tested: pressure and discharge variation percentages along the laterals, actual system flow, wetted diameters, mean distribution uniformity “DU%” and Christiansen’s coefficient of uniformity “CU%”. The results of the tests showed acceptable design parameters. The average DU% values of Hydro-zones A and B in Plan I were 64% and 66% respectively while CU% values were 75% and 69.3% respectively. The average DU% values of Hydro-zones A and B of Plan II were 60% and 86.3% while the CU% values were 75.3% and 92% respectively. The statistical analysis did not show significant differences between the pressure and discharge variation values, for both Hydro-zones of the two different Plans. However, significant differences were observed between the different mean values of DU% and CU% of Hydro-zone B, but no significant differences between the DU% and CU% mean values were found, for Hydro-zone A. (P =603; 0.05).