|Author:||Bièvre, B. de ; Alvarado, A. ; Timbe, L. ; Célleri, R. ; Feyen, J.|
|Book Group Author:||NA|
In many medium-sized irrigation systems water is wasted during the night because demand is low and supply is not reduced accordingly. A hydrodynamic model was applied, using MIKE 11 as a software tool, to simulate abrupt discharge changes and their travel times along small irrigation canals. Filling and emptying of the canal were also analysed. The model was calibrated with data of a field experiment that included startup, positive, and negative surges. A technique was developed to take into account the considerable water losses in the canal. Performance indicators efficiency, adequacy, equity, and dependability, proposed by Molden and Gates in 1990, were redefined using the concept of usefully delivered discharge. The newly defined indicators were consequently used to find the gate operation scenario that meets optimally the target day and night discharges. It was found that it is feasible to implement night delivery reduction. The calibrated model was used to develop guidelines for the operation of the canal with daily flow variation, resulting in considerable water savings during the night.
|Pages:||108 - 116|
|Journal:||Journal of Irrigation and Drainage Engineering|
demand, discharge, hydrodynamics, irrigation, irrigationsystems, simulation models, water conservation, water supply, water useefficiency, Ecuador, South America, America, Developing Countries,Threshold Countries, Andean Group, Latin America, water supplies,watering, Soil Water Management (Irrigation and Drainage) (JJ800)(Revised June 2002) [formerly Soil Water Management], Mathematics andStatistics (ZZ100)