Document Type : Original Article
Authors
Abstract
Assessment of low irrigation efficiency in the country and providing appropriate solutions to improve irrigation efficiency and water productivity at the national level can be a great help for modifying irrigation efficiency. For this purpose, available data on irrigation efficiencies in different irrigation systems and differnet irrigation networks (traditional and modern) were analyzed. Analysis was based on results obtained from about 200 field scale studies carried out in some provinces including 1900 measured irrigation events across Iran from 1991 to 2015. The finding showed that application irrigation efficiency (Ea) ranged between 22.5 and 85.5% and having meant of 56%. The averages of Ea in basin, border and furrow irrigation systems were 55.3, 52.9 and 52.5%, respectively. Eventhogh, Ea in sprinkler irrigation systems for example wheelmove and solid set systems were 66.9 and 52.1%, respectively. Average of Ea in pressurized and surface irrigation systems were 66.6 and 53.6%, respectively. As well as, Ea in sprinkler and drip irrigation systems were 62.1 and 71.1%, in order. Results also indicated that Ea over three decades (1992-2001, 2002-2011, and 2012-2015) were 52, 58.4, and 58.8%, respectively. However, network irrigation efficiency was 67, 68.5 and 74.2% in these 3 decades in order. As a result, total irrigation efficincey (Ep) was 29.7, 36 and 43.8% in these decaceds, respectively. This meant that, Ep had annully increased about 1% from 1996 to 2013.
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