Hydropower production is common in the upper part of the basin, and cascades of dams form big reservoirs.87 Many small dams arc used for irrigation purposes and fish-breeding. In Turkey, seven dams and one regulator are under operation on the Ergenc River and its tributaries, serving irrigation, flood control and some drinking water supply purposes (15% of drinking water of Edime and Kirldareli cities is supplied from two reservoirs, Suloglu and Armagan). There arc also 53 small dams located on several tributaries used for irrigation.