Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/50203
Title: Maximum length of subsurface drip irrigation laterals subjected to backpressure
Keywords: Discharge exponent
Dripline
Flow rate coefficient of variation
Irrigation line hydraulics
Lateral design
Expoente de descarga
Irrigação por Gotejamento
Coeficiente de Variação de gotejadores
Linha lateral
Issue Date: Mar-2021
Publisher: Academia Brasileira de Ciências
Citation: THEBALDI, M. S.; RODRIGUES, K. V.; TAMBO, F. L. R. Maximum length of subsurface drip irrigation laterals subjected to backpressure. Anais da Academia Brasileira de Ciências, Rio de Janeiro, v. 93, n. 1, e20191338, 2021. DOI: 10.1590/0001-3765202120191338.
Abstract: To achieve a better SDI system design, the emitters’ hydraulic characteristics and the flowrate uniformity along lateral lines under backpressure influence must be known. The objective of this study was to evaluate the effect of backpressure on the maximum length of irrigation laterals using two types of emitters (pressure-compensating and nonpressure-compensating) in different situations. Data from a field experiment combined with information obtained from a previously published paper was used, that tested driplines hydraulics behavior influenced by backpressure. The lateral dripline design technique based on statistical approach developed by Anyoji & Wu 1987 was used to calculate the maximum length. The variables that most influenced the maximum length of the laterals were the terrain slope and permissible flowrate variation. For nonpressure-compensating emitters, the maximum length of the irrigation laterals is up to 5% greater in subsurface applications than in surface applications. For pressure-compensating emitters operating under the influence of backpressure, there is an increase in the discharge exponent due to the small difference in flowrate between the surface and subsurface conditions, which also increases the influence of pressure variations on the flowrate thus, the surface laterals are up to 8% longer than the subsurface ones.
URI: http://repositorio.ufla.br/jspui/handle/1/50203
Appears in Collections:DEG - Artigos publicados em periódicos

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