Detail Design and Construction Consultancy Services for Bor̤ka Dam and Hydroelectric Power Plant РTurkey

Project Name: Detail Design and Construction Consultancy Services for Borçka Dam and Hydroelectric Power Plant

Country: TURKEY

Finance Source: Commercial Credit

Tags: Turkey, Local, HEPP, Design, Supervision

Borçka Dam located on the River Çoruh is the one before last one of the system of dams within Turkish borders. It has a catchment area of 19 255 km2. The dam is a zoned fill with clay core type with a height of 86 m. above foundation, a crest length of 728 m. (including concrete structures), embankment volume of 7 785 000 m3. Volume of its reservoir is 418.95 million m3. and the spillway capacity is 10 639 m3./sec. It has two horse-shoe section diversion tunnels having inner diameter of 7.50 m. and each having length of 353 m. (including inlet and outlet structures). The main purpose of the dam is the production of 1039 GWh of hydroelectric energy through its powerplant with 2 units, each with an installed capacity of 150 MW. The controlled spillway consists of 4 openings; each equipped with a radial gate 16 m. wide and 17.3 m. high. These openings are separated by 3 piers, each with a width of 5.0 m. A chute 79 m. wide and 226 m. long with a stilling basin 79 m. wide and 134 m. long will be used to dissipate the energy of probable maximum flood.

The project was the implementation of Borçka Dam and HEPP on a turnkey basis with full financing of all the works by the Turn-Key Consortium consisting of VA TECH Elin (Austria), Voith Sulzer (Austria), VA TECH VOEST MCE (Austria) and Verbund Plan (Austria) forming the Electromechanical Works Party and Strabag Österreich (Austria), Yüksel İnşaat (Turkey) and Temelsu (Turkey) forming the Civil Works Party. Temelsu and Verbund Plan executed the proper overall coordination. In addition to project management activities, TEMELSU in particular was responsible for the preparation of the detail designs and as-built drawings for all the civil works of the project.

Preparation of Detailed Designs and Construction of the relocated Borçka-ArtvinState Road which would be inundated by Borçka Dam Reservoir was also within the scope of the project. Total length of the road is 19.86 km and the platform width is 12 m. Along the road there are:
– 4 viaducts (total length : 970 m, and max. pier height is 71.60 m. and max. number of spans is 12 )
– 10 tunnels (total length: 3649 m. and max. length of the tunnels is 920 m.)
– 37 box culverts
– 3550 m of retaining walls