Journal of Food, Agriculture and Environment

The evaluation of water distribution uniformity in solid set sprinkler systems

Author(s):

Maaroof Siosemarde ¹*, Motalleb Byzedi ², Davood Akbari Nodehi ³

Recieved Date: 2012-02-14, Accepted Date: 2012-05-06

Abstract:

Uniformity of water distribution is a measure of the variability in application depth over a given area. Two methods have been developed to quantify uniformity, distribution uniformity (DU) and the coefficient of uniformity (CU). During the irrigation season in 2009 and 2010, 12 solid set sprinkler system catch can tests were conducted in 3 steps at 12 farmer’s field in the area of collective irrigation in Saghez region, Kurdistan province, at northwest of Iran, in order to evaluate the distribution uniformity in solid set sprinkler systems. Uniformity indicators were sorted into different sprinkler spacings. The CU variability was large, ranging from 54.0 to 73.0%, with an average value of 61.8%. The average values of CU in the 30 m x 30 m, 25 m x 30 m and 25 m x 25 m sprinkler spacing were 56.1, 63.6 and 65.6. The results showed that when sprinkler spacing decreased, the uniformity coefficient of CU increased, therefore the results showed the acceptable values of CU were obtained from low sprinkler spacing. The DU variability was large, ranging from 36.0 to 58.3%, with an average value of 46.3%.  Of sprinkler systems tested in this study 41.7%, 41.7% and 16.7% would be considered  “fair” (50–59), “poor” (40–49) and fail” <40, respectively. The average value of Christiansen uniformity of system (CUs) and Distribution Uniformity of system (DUs) were 58.4% and 42.6%. Pressure differences across the solid set sprinkler systems varied ranging from 23.3 to 68.3%, with an average value of 39.9% that all of them were over 10% which is considered unacceptable. It was concluded that pressure variations did negative impact on uniformity. The result showed that VK solid set sprinkler system with 68.3% pressure differences had the least distribution uniformity. 

Keywords:

Christiansen coefficient of uniformity, distribution uniformity, irrigation, Saghez region, solid set

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Journal: Journal of Food, Agriculture and Environment
Year: 2012
Volume: 10
Issue: 2
Category: Environment
Pages: 818-822

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