Determining the water conveyance loss in large-scale irrigation systems is important not only from the points of view of irrigation programming and optimum allocation of deficit resources, but also for the sustainable operation of the system. The aim of this investigation is to determine the conveyance losses of the concrete-lined main, secondary and tertiary canals in the Right Bank Irrigation System of the Ahmetli Regulator in the Gediz Basin, Turkey. The investigation was carried out according to the inflow-outflow method. Average conveyance losses of the main (0.067 l s À1 m À2 ), secondary (0.119 l s À1 m À2 ) and tertiary canals (0.030 l s À1 m À2 ) were found to be higher than either the average conveyance loss of Turkey or the seepage standard of the Bureau of Reclamation. It may be suggested that associations responsible for maintenance, repair and operation of the system can be supported financially to reduce conveyance loss. Apart from this, application of new technologies with lower cost to the systems will reduce conveyance losses. In addition, the participation of farmers in the maintenance of the network will ensure that the system is used more rationally. In this way, most of the operational problems of the system can be solved. Copyright # 2010 John Wiley & Sons, Ltd. , 0.030 l s À1 m À2 dans les canaux primaires, secondaires, et tertiaires, respectivement. Ces valeurs sont plus élevées que celles habituellement observées en Turquie, ou que la norme d'infiltration de l'USBR. Dès lors on ne peut que suggérer de financer les associations chargées du fonctionnement et de l'entretien, ce qui n'exclut pas la participation des agriculteurs à ces opérations. En dehors de cela, l'application de nouvelles technologies à faible coût pour les systèmes de réduire les pertes de transport. En outre, la participation des agriculteurs à l'entretien est un gage d'utilisation rationnelle du système.
An increase in demand, and droughts in recent years have resulted in the need for tools to allocate limited water between users in different regions in order to achieve economic, social and environmental benefits. Multi-objective planning is an important decision support tool for natural resource management. Planners, decision makers and stakeholders use this approach in the decision-making process. In this research, a multi-objective planning model was developed and applied on the Menemen Left Bank Irrigation System of the Lower Gediz Basin in Turkey. The aims of the model were to increase the benefit from production, to increase the size of the total area irrigated, and to reduce the water losses occurring at network level. The model was applied to an open channel system consisting of 44 tertiary channels receiving water from three secondaries, serving an area of 3,606 ha. The model predicted a 20.63% increase in income, and a 29.26% decrease in the total irrigation water requirements of crops dependent on projected changes in the actual crop pattern of the research area. This decrease caused a reduction of 29.90% in expected water losses over the network as a whole. The operation of the model enabled optimum productivity and income at the system level per unit of land and water resources.
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