Improving water productivity (WP) in agriculture sector, as the main water user, plays an
important role in resolving water shortage problems.
Increasing irrigation efficiency and upgrading irrigation systems are the main strategies for this object. Different studies have been carried out on irrigation systems evaluation and water-yield relationships but no studies have been investigated the effect of irrigation efficiency indices on WP. In this study, the received water in various parts of the field was calculated based on uniformity coefficient (CU) and irrigation adequacy (pa) equations and then the effect of these indices on crop yield and WP was estimated based on wheat, barley and maize wateryield functions in Karaj and Qazvin regions (Shoor river basin). Results showed that the uniformity coefficient and adequacy have high effect on crops yield and crops WP and integrated study of these indices has high necessarily in irrigation management and deficit irrigation planning. Methodology of this study could have useful applications in design optimization, management and promotion of irrigation systems and in deficit irrigation planning.