APPLICATION AND DISTRIBUTION OF IRRIGATION WATER UNDER VARIOUS SIZES OF CENTER PIVOT SPRINKLER SYSTEMS
Zafar Islam*, Abdul Ghafoor Mangrio*, Muhammad Munir Ahmad*, Ghani Akber*, Sher Muhammad**, Muhammad Umair*** and Yaskina****
ABSTRACT
The field study was carried out to evaluate the comparative efficiency of three low pressure central pivot sprinkler irrigation systems for their water distribution, uniformity and tendency to recommend changes in system maintenance or repair. The main objective of this study was to evaluate existing central pivot sprinkler irrigation systems under field conditions at different locations in the country. The study was carried out to evaluate water distribution under central pivot irrigation systems at three locations; National Agricultural Research Center (NARC), Islamabad, Arid Zone Research Institute, Bahawalpur (AZRI, BWP) and Thana Boula Khan (TBK, Sindh) in Pakistan. Water distribution coefficients used in the evaluation were: Christiansen's coefficient of uniformity (CU %), distribution uniformity (DU %) and scheduling coefficient (Sc %). The results showed that overall mean values for the coefficient of uniformity ranged from 87 to 92%, distribution uniformity ranged from 90 to 93% and scheduling coefficient ranged from 1.07 to 1.12. The results showed that overall mean value of Christiansen Coefficient of Uniformity (CU) was 87%, 91% and 92% and Distribution Uniformity (DU) was 93%, 92% and 90% of NARC, BWP and TBK locations, respectively. According to review the DU and CU for all center pivot sprinkler systems should be in the range of 85% or greater and 90-95%, respectively, for excellent ratings. Scheduling coefficient of NARC, BWP and TBK locations were obtained 1.09, 1.07 and 1.12, respectively. Also the calculated linear relationship between values of CU and DU in the all sprinkler systems tested in this study is as follows: CU = 100-0.8(100-DU) R2=0.697
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