Water distribution by irrigation microsprinkler
DOI:
https://doi.org/10.5902/2179460X40584Keywords:
Uniformity, Wetted pattern, Flow pressure curveAbstract
Many factors affect the water distribution by microsprinklers, such as the pressure, nozzle diameter, geometry and environment conditions. The distribution is characterized in tests under standard conditions established by ISO 15084 (2004). Thus, the purpose of this work was to evaluate the microsprinkler manufactured by Brazilian company Agrojet, used to irrigate orchards in Cachoeira do Sul. Microsprinklers used in the tests were equipped with yellow nozzle which has 2.3 mm in diameter, and operating at pressure of 147 kPa (21.5 psi). A grid of collectors at 0.5 m apart was placed around the microsprinkler to capture water during 1 h. The highest application rate throughout the radii was detected near the microsprinkler, and the distribution was considered non-uniform between quadrants, due to emitter geometry. There was also a gap in the application ranging from the microsprinkler to the end of its radius as a result of the frame that holds the rotor, which is thick and forms an obstacle to the water jet. Therefore, the water distribution was not satisfactory. Even so, aligning the microsprinkler frame to the irrigated tree might be a solution to minimize such effects in the non-uniform application.
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References
ABNT NBR ISO 15084. Irrigação localizada – microaspersores – requisitos gerais e métodos de ensaios. Rio de Janeiro: ABNT, 2004.
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SARETTA E, CAMARGO AP, BOTREL TA, FRIZZONE JA, KOECH R, MOLLE B. Test methods for characterising the water distribution from irrigation sprinklers: Design, evaluation and uncertainty analysis of an automated system. Biossystems Engineering. 2018; 169: 42-56.
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