Determining Operating Inlet Pressure Head Incorporating Uniformity Parameters for Multioutlet Plastic Pipelines
Publication: Journal of Irrigation and Drainage Engineering
Volume 134, Issue 3
Abstract
An important objective of a microirrigation system is to determine the proper operating inlet pressure head, ensuring the desired level of water application uniformity as well as the allowable pressure head variation along the multioutlet pipeline. This paper offers, simple, direct, but sufficiently accurate, relationships incorporating different microirrigation uniformity parameters, such as Christiansen uniformity coefficient, coefficient of variation of emitter discharge, and allowable pressure head variation, to determine the operating inlet pressure head (i.e., pressure head and outflow profiles) for multioutlet plastic pipelines. In this analysis some mathematical expressions were deduced to relate three uniformity parameters; then the operating inlet pressure head is simply reformulated by taking into account a multiplying factor to the required average outlet pressure head, in terms of three uniformity parameters. Resulting, the influence of different uniform pipe slopes on the water application uniformity and the operating inlet pressure head for various emitter discharge exponents, was evaluated. In addition, to cover various design combinations an extensive comparison between the proposed equations and those of the previous studies was also presented. Examination of the results from this research indicated that, the performance of the proposed technique is sufficient in comparison to those of the recent analytical and numerical procedures.
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Acknowledgments
The writer thanks the Editor and four anonymous reviewers for providing constructive reviews and clear criticisms on the content of the paper.
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Information & Authors
Information
Published In
Journal of Irrigation and Drainage Engineering
Volume 134 • Issue 3 • June 2008
Pages: 341 - 348
Copyright
© 2008 ASCE.
History
Received: Jan 5, 2007
Accepted: Sep 20, 2007
Published online: Jun 1, 2008
Published in print: Jun 2008
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