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Definitions: <br />Efficiency <br />An index of performing a task with minimum of waste [sic] effort; as a ratio <br />usually expressed as per cent." Jensen in: Hagen et al (1967) <br />• Application Efficiency <br />The efficiency associated with a single irrigation event on a specific field or farm. <br />Burt et al (1997) <br />• Irrigation Efficiency <br />The average efficiency of multiple irrigation events over a period of time on a <br />specific field or farm. Burt et al (1997) <br />• Potential / Theoretical Design Efficiency <br />• "Potential efficiency is a measure of the optimum application efficiency for the <br />method of irrigation being used ... based on full canopy cover, and the <br />assumption that the systems are well designed and maintained." FIRI <br />Monograph (USDA, 1991) <br />• "Provides estimate of what level of AE is possible, assuming proper timing of <br />irrigation event..." Burt et al (1997) <br />