Use of simulation models to evaluate irrigation performance including water productivity, risk and system analyses |
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Authors: | Peter Droogers Geoff Kite Hammond Murray-Rust |
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Institution: | (1) International Water Management Institute, PO Box 2075, Colombo, Sri Lanka e-mail: p.droogers@cgiar.org Tel.: +94-1-867404; Fax: +94-1-866854, LK |
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Abstract: | Worsening water scarcity will increase pressure to use water more productively. In the classical view of irrigation research,
some important aspects are often ignored: the total water balance approach, productivity of water, food security, and irrigation-system
level analyses. These four approaches were evaluated using a detailed agro-hydrological model applied to an irrigation system
in western Turkey. Emphasis was placed on the two dominant crops in the area: cotton and grapes. According to the classical
point of view, the only result would be to irrigate the cotton with 1000 mm and the grapes with 800 mm. From the water productivity
point of view, however, the water productivity of grapes appeared to be maximal without any irrigation; while for the cotton,
irrigation at 600 mm maximizes water productivity. To minimize risks and increase yield stability, grapes perform better than
cotton. Finally, from the irrigation system point of view, decisions can be made about the desirable cropping pattern and
the distribution of water between crops. With limited amounts of water available for irrigation, a cropping pattern consisting
mainly of grapes is desired; while with higher water availability, a mixture of cotton and grapes is preferable. The methods
presented provide a clear methodology with which to achieve the most productive use of water.
Received: 3 June 1999 |
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