The aim of the project, which was financed by the Japan International Cooperation Agency (JICA), is to supply drinking water to the Turkey’s capital, Ankara, through a 31.58-kilometer-long tunnel. With the project, the waters of the Gerede Stream, which is a tributary of the Filyos River, are transported to the Çamlıdere Dam via the Işıklı Regulator and a transmission tunnel in which a gravity flow is ensured. The outlet structures for connection to the Eşik stream are constructed as part of the project. The tunnel, which has a diameter of 4.5 meters and a length of 31,580 meters, was excavated simultaneously using three tunnel-drilling machines. The project was carried out in very difficult and variable ground conditions at a distance of 15 kilometers from the North Anatolian Fault Line. The tunnel aims to transfer 226 million cubic meters of water annually to Çamlıdere Dam with a flow rate of 40 cubic meters per second.
Employer: DSI, Department of Drinking Water and Sewarage