Performance and Sensitivity of Irrigation Offtakes.

Document Type : Research Studies

Author

Irrigation & Hydraulics Department., Faculty of Engineering., El-Mansoura University., Egypt.

Abstract

Inaccurate operation and management of irrigation canals often cause inequitable and inefficient water distribution. The adjustment of hydraulic structures along irrigation canals aims to maintain a hydraulic targeted state in order to satisfy the water management objectives. This causes unsteady flow in the canals at the initiation of revised operation till it attains a new steady state. For evaluation of water distribution efficiency to offtakes of irrigation canals, two operation performance parameters. which take into account the effect of unsteady flow, were used. The first one is the delivery performance ratio and the second parameter is the operation efficiency. Two types of sensitivity in the analysis of offtakes were considered. The first one is the sensitivity of delivery which considers the impacts of the perturbation on the delivery to the dependent canal through the offtake. The second type is the sensitivity of conveyance which takes into account the effects on the conveyance discharge of the parent canal. Sensitivity indicators enable the identification of sensitive offtakes and assessment of tbeir operational tolerance. Performance and sensitivity analysis for a reaeh of El-Bohia canal downstream Met Ghamr regulator was studied using the numerical hydraulic simulation. Sensitivity of delivery along this reach was estimated for each offtake using both the numerical hydraulic simulation and the analytical approach. 

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