• From this study on the Chubek Irrigation System in Tajikistan, a new relative irrigation performance index-water use ratio (WUR)-proved effective and reliable given favorable remote sensing conditions and climatic and cropland data. • The WUR is particularly suitable for river basins and large irrigation systems in developing countries where data on irrigation canal flow are not available or limited. • A quantitative performance index-irrigation consumptive use coefficient (ICUC)-was also applied. But this requires reliable canal flow data, which were unavailable in the case presented. • It is highly recommended that both WUR and ICUC are used for monitoring and evaluating irrigation performance at project completion and for future water management. • For reliable canal flow data, flow recording devices are needed. Strong institutional arrangements, trained staff, and resources for essential equipment are also required. • Results of the study provide a valuable guide for assessing irrigation system performance using remote sensing data as well as modernizing existing systems and designing new ones.
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