SHARING SUCCESS Deriner Dam, Artvin, Turkey Deriner Dam, located in Artvin, North Eastern Turkey, is 249 metres high and features a double-curvature concrete arch. It is the tallest dam of any kind in Turkey and ranks in the top 10 of the highest concrete dams in the world. Its purpose: hydropower. BACKGROUND the world at the time and, in terms of volume, SUCCESS FACTORS About one-fifth of the world’s electricity is pro- remains the largest embankment dam in Pöyry’s work at Deriner Dam required a duced in hydropower stations. It’s an efficient Turkey today. high-level of partnership: with DSI and and sustainable way of generating power. The a number of other firms that formed the General Directorate of State Hydraulic Works CLIENT CHALLENGE contractor’s consortium. (DSI) in Turkey has a mission1: “to develop all The full scope of the project included con- A clear governance model was water and land resources in Turkey…wisely struction of a double curvature arch dam, established that enabled seamless col- using natural resources.” In 1969, a survey diversion tunnel, underground powerhouse, laboration and project of the energy potential of the Coruh River two completely separate spillway concepts transparency between the client, Pöyry was carried out, and the construction of the and infrastructure including access roads. and our consortium partner, Dolsar Engi- Deriner Project commenced almost three Construction began in 1998 and held a neering Inc Co. decades later. number of daunting challenges: the site was situated in a remote, mountainous region. “Because Deriner presented so many In 1987, DSI awarded Pöyry as a key partner challenges, it was important for us to for the project based on their ability to handle The spillway structures had to safely manage partner with a company that brought new the complexities and scale involved with the large design floods. The dam is a massive ideas and innovative solutions to the table. dam. Pöyry was well known in Turkey for work structure. In 2004, funding for the project Pöyry did just that and delivered every- on the Karakaya and Ataturk Dam & dried up as Turkey, like many world econo- thing with the Hydroelectric Power Plant Projects. mies, suffered the effects of the global highest standards of quality and safety in Ataturk was the largest embankment dam in financial downturn. mind”, states DSI. 1 From the DSI’s website: http://www2.dsi.gov.tr/english/about/goreve.htm# SOLUTIONS supporting the installation and commissioning Deriner Dam now holds back the Coruh River, Given the height of the mountains of the turbines and generators. creating one of the deepest surrounding the Coruh River Valley, Pöyry man-made lakes on the globe, that holds designed a double curvature concrete arch BENEFITS more than two trillion litres of water. The dam that was unusually tall—249 metres, The reservoir began to fill in February 2012 reservoir has also opened the way for new just 50 metres shorter than the Eiffel Tower. and the power station wascompleted in Feb- recreational activities like boating and fishing. They also recommended building two spillway ruary 2013. The benefits of the Deriner Dam concepts, one with tunnels that are steeper to the country of Turkey are wide-ranging: than any other spillways of their kind and For starters, there is now an additional the second including eight orifice spillways 2,118 GWh of electrical energy annually to through the body of the dam. Pöyry also power the country. The installed capacity of recommended an innovative grout curtain de- 670 MW is enough to continuously power the sign that was shortened to an unprecedented equivalent of 670,000 standard 1kw heaters, depth. or more than 60 million high-efficiency light bulbs. The authorities are better-equipped Pöyry have remained a dedicated partner to to manage flood and sedimentation in the DSI through the 15-year construction phase Coruh Valley. And, thanks to a recommen- so far, reviewing contractors’ designs, provid- dation by Pöyry to reduce the cementitious ing technical advice during construction, content in the dam concrete, many millions assisting quality control on site, and of dollars could be saved by the client. KEY FACTS The 249m high Deriner dam is a double curvature arch structure.The underground power house will have four vertical Francis units of 167.5 MW each, and a total energy production of 2,118 GWh/year. Key services provided by Pöyry on the Deriner Dam project include: • Final Design • Site presence providing technical support throughout construction • Supervision of laboratory and field tests before and during construction • Progress and quality control • Inspection and control of electromechanical equipment • Assistance for commissioning • Technical management of the project Consulting. Engineering. Projects. Operations. Smart solutions across power generation, transmission & distribution, forest industry, chemicals & biorefining, mining & metals, transportation and water. 6000 experts. 45 countries. 150 offices. Pöyry P.O.Box 4 (Jaakonkatu 3) FI-01621 Vantaa, Finland Tel +358 10 3311 www.poyry.com.