Canal Capacities for Demand Under Surface Irrigation
Publication: Journal of Irrigation and Drainage Engineering
Volume 112, Issue 4
Abstract
Providing water to users on demand usually requires an increase in canal capacity over the same volume of water delivered at a uniform rate. A simulation model was used to develop demand patterns for hypothetical surface irrigation conditions. These results were used to determine the canal capacity required to meet various levels of demand. A modification to these results was hypothesized to be appropriate for delivery schedules where delivery is arranged. These results are expressed in simple, nondimensional terms and compared to capacities for continuous flow and rotation systems and to capacities from Clement's demand formulas. It is shown that Clement's formulas which were developed for sprinkler irrigation are inappropriate for surface irrigation demand since they do not account for the wide variations in possible conditions. Results are particularly inappropriate for small relative service areas. Simple canal capacity equations were developed for demand and arranged surface irrigation distribution systems for a 90% level of service (i.e., water is available 90% of the time when demanded).
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References
1.
Clement, R., “Computation of Flows in Irrigation Systems Operating ‘On Demand,” La Société du Canal de Provence et d'Aménagement de la Region Provencale, Le Tholonet, 13 December 1965, English translation by U.S. Bureau of Reclamation, Denver, Colo., June, 1979.
2.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 112 • Issue 4 • November 1986
Pages: 331 - 347
Copyright
Copyright © 1986 ASCE.
History
Published online: Nov 1, 1986
Published in print: Nov 1986
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