Evaluating Center Pivot Distribution Uniformity from Catch Can Tests

Abstract

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Irrigation uniformity under different socio‐economic conditions: evaluation of centre pivots in Aragon (Spain) and Utah (USA)

“…Inlet pressure averaged 198 kPa, which is significantly lower than in Aragon and in other areas located in the USA (Henggeler and Vories, 2009). In the Utah systems, water pressure was not provided by collective networks and pumping stations, but by individual pumps owned and operated by each farmer.…”

“…The annual operational cost of increasing inlet pressure 50 kPa would amount to about €9 ha À1 (US$13 ha À1 ) for the average centre pivot configuration. Renozzling centre pivots would involve an annual investment cost of about €5 ha À1 (US7 ha À1 ), considering an interest rate of 8% and a 10-year return period (Henggeler and Vories, 2009). Finally, the cost of an irrigation evaluation and a detailed analysis of the state of the sprinkler package is estimated at €5 ha À1 (US$7 ha À1 ).…”

“…() in north‐east Spain under a mean wind speed of 1.9 m s −1 . In Missouri (USA), Henggeler and Vories () reported an average CU of 80% (maximum 92%, minimum 49%) in 60 evaluations (no wind data available).…”

“…However, the average CU was only 75% (maximum 90%, minimum 59%) in 10 evaluations performed by Dechmi et al (2003a) in north-east Spain under a mean wind speed of 1.9 m s À1 . In Missouri (USA), Henggeler and Vories (2009) reported an average CU of 80% (maximum 92%, minimum 49%) in 60 evaluations (no wind data available).…”

Effects of Travel Speed and Collector on Evaluation of the Water Application Uniformity of a Center Pivot Irrigation System

“…Water application uniformity is important when designing and operating a sprinkler irrigation system [5]. Poor water distribution by center pivot systems can lead to surface water ponding, runoff, and leaching of agricultural chemicals into the groundwater [6][7][8][9]. The significant influence of water application uniformity on crop production [10] means that uniform water application should be taken into account when using center pivot irrigation systems.…”