Definition:
The overall efficiency, also known as project efficiency (Ep), comprises conveyance efficiency (Ec), field canal efficiency (Eb), and field application efficiency (Ea).
Source:
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Food and Agriculture Organization of the United Nations, AQUASTAT Web Site
FAO-SAFR, 2002, Irrigation Manual Module 1, Irrigation Development: a Multifaceted Process, By: Andreas Savva & Karen Frenken