Dez Hydroelectric Plant

The Dez River hydroelectric plant is on the Dez River in the Khuzestan region.
The project is designed and built to regulate the flooding of the river in order to use the water for hydroelectric and irrigation purposes.
The power plant and all its accessory structures are built underground, along with the surface outlets on the left bank, the intake structures on the right bank, and the penstocks.
The concrete dam, with a thin double curve arch, has a maximum height of 203.50 m, a crest length of 240 m, and a thickness of 21 m at the base and 4.50 m on the crest.
Three 2.74-m-diameter ducts are built in the body of the dam to provide water for irrigation purposes.
There are two surface outlets on the left bank, each controlled by two large sector gates; they consist of two upper horizontal tunnels which empty through shafts into two lower, circular-cross-section tunnels having a diameter of 14 m and 12.60 m, respectively, which are about 400 m long.
The power plant, together with its underground accessory structures, is located on the right bank and is 76 m long, 18 m wide, and 36 m high. The plant is designed for the installation of four 65-MW turbine-alternator units.

Client: Plan Organization of the Government of Iran