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Benchmarking can be defined as the identification and application of organization specific best practices with the goal of improving competitiveness, performance and efficiency.In this study, irrigation schemes of the State Hydraulic Works (DS _ I I) 10th Region were taken as material for benchmarking irrigation performance for the years between 1996 and 2000. Each system's performance is assessed using a number of indicators proposed by the IPTRID/World Bank study on benchmarking in the irrigation and drainage sector, and benchmark values for performance identified. Whilst further work is required, it is considered that this study provides a valuable starting point for benchmarking performance of irrigation systems in Turkey. This is seen as timely given the increasing demands being placed on the available water resources in the country.

The GAP area faces salinity problems caused by irrigation. The region is situated in the arid and semi-arid climatic zone of Turkey. After the irrigation systems became operational, salinity and sodicity problems along with drainage problems increased. Salinity and also drainage problems relating to GAP are at present more a priority than irrigation. The research trend is to develop an appropriate approach to tackle the salinity problem in the region. In this study, salinity in GAP, particularly salinity problems related to the Sanliurfa-Harran Plain, was considered, and options for solution of the problem were discussed. Copyright # 2005 John Wiley & Sons, Ltd.key words: salinity; drainage; GAP; Turkey RÉ SUMÉ La zone GAP est confronté a des problèmes de salinité causés par l'irrigation. La région est placée dans la zone de climat aride et semi-aride de Turquie. Après mise en service des systèmes d'irrigation des problèmes de salinité et de sodicity ainsi que les problèmes de drainage ont augmenté. La salinité et aussi les problèmes de drainage dans le GAP sont à présente plus prioritaires que l'irrigation. La tendance de recherches est de développer une approche appropriées pour resoudre le problème de salinité dans la région. Dans cette étude, la problematique de la salinité dans le GAP, particulièrement les problèmes de la Plaine de Sanliurfa-Harran ont été évalués, et differents solution du problème ont été discutées.

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