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Uniformity of Sprinkler Irrigation System and Head Loss by Various Equations of Head Loss

Department of Soil & Water Engineering, CCS Haryana Agricultural University, Hisar-125 004 (Haryana), India
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(Received : December 17, 2017; Accepted : February 11, 2018)

A field experiment was conducted at Luhana village in district Rewari (Haryana) to check the uniformity and head loss of sprinkler irrigation system. Solid set semi-permanent hand move type of sprinkler system with 15 hp pump was used in the present study. The sprinklers were placed at 6 m apart and spacing between catch-can was 1.5 m apart in a square grid. Discharge of sprinkler was 0.351 l/sec and that of main line was 4.5 l/sec. For uniformity coefficient, 30 catch- cans were placed between the four sprinklers. Sprinklers were operated for 45 min and discharge collected in catch-can was observed. Using Christiansen equation uniformity coefficient was observed. It was 83.4%. A head loss in the sprinkler system was measured by Scobey’s equation, Darcy-Weisbach equation, William-Hazen equation and Manning formula. Head loss 0.3, 1.16, 1.17 and 1.29 m was observed from Darcy-Weisbach equation, William-Hazen equation, Manning formula and Scobey’s equation, respectively. Minor head loss at joint and L-band was 0.013 m. Every head loss equation showed different values, but uniformity of sprinkler system was good. Conclusively, Darcy-Weisbach was considered to be good for calculation of the head loss in main line of sprinkler system.

Key words : Sprinkler, irrigation, uniformity coefficient, head loss, Scobey’s formula, Darcy-Weisbach equation, William-Hazen equation, Manning formula