Abstract
AbstractLimitations on available water have caused increased attention toward research on techniques to use water more efficiently. In this study, the actual water application efficiency of rice paddy fields for 13 different sites throughout the province of Guilan, Iran, was investigated. Based on field measurements of water inflow and outflow, deep percolation and calculation of evapotranspiration, water application efficiency was determined for cases where the outflow was considered as a loss, i.e. at field scale, and for cases where a percentage of the outflow was considered as recoverable water, i.e. regional scale. The results show that, at field scale, the application water efficiency for the western, central and eastern section of the Sefidrood Irrigation Network was 38, 41 and 34%, respectively. On the other hand, at regional scale, if 80% of the outflow were considered as recoverable water, the above values were found to be 52, 51 and 46%, respectively. More recent proposed definitions on water management, such as consumed fraction (CF) and recoverable fraction (RF = 1 − CF) are also evaluated. Calculation of CF and RF values indicate that water potentially available for reuse is about 60% for the entire network. Copyright © 2008 John Wiley & Sons, Ltd.
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