Deriner Dam
Marginal Column

Tough Application

Precise synchronization of the movements of overflow flap gates and middle outlets.

Ingenious Solution

Maximal safety and availability thanks to a custom-tailored system solution consisting of electronically controlled hydraulic drives.


“Rexroth was the only partner for all tasks concerning the management of flood water and developed solutions for all requirements in order to supply a turnkey solution.”

Hilmi Kaplan, Project Manager ERG

Flap gate at overflow

Solved with

  • Overflow flap gates: 2 aggregates with 3 motor/pump groups each and 2 hydraulic cylinders
  • Middle outlets: 3 aggregates with 4 motor/pump groups, 10 hydraulic cylinders
  • Control systems


Deriner Reservoir Dam, Turkey: More Safety and Optimal Availability

Custom-tailored System Solution by Rexroth for Maximal Reliability

The Deriner reservoir dam at the river Çoruh was built by ERG Insaat Ticaret ve Sanayi A.S. for the energy supplier DSI State Hydraulic Works. It is the largest construction of its kind in Turkey. For the eight middle outlets and the two overfl ow fl ap gates, Rexroth provided all the hydraulic drives complete with the electronic control system.

The civil engineering specialists from Ankara have been designing, constructing and building reservoir dams, hydroelectric plants, irrigation systems and mining machines since 1972. At the Deriner dam, the company made use of Rexroth technology. With decades of experience in hydromechanical works and the design of finely tuned system solutions consisting of hydraulic drives and electronic control systems, Rexroth commended itself as the ideal partner for this project – even more so as the Turkish branch office can provide customer support directly on location.

Maximal Safety and Flexibility

DC hydraulic drives control the middle outlets and the overflow flap gates in order to ensure the optimal flood water management. They significantly contribute to the safety of the entire dam. All the drives can be controlled electronically from one central control station.

Precision with Rexroth Know-how

The precise synchronization of the drives is extraordinary: at the two overflow flap gates the Rexroth solution accomplishes a synchronization accuracy of 0,4 °. Rotation sensors transmit the exact position of the gates to the control system and a fibre optic cable facilitates instantaneous synchronous movements. The position sensor systems of the hydraulic cylinders transmit position signals from the protected middle outlets to the control system to ensure the synchronous movements of two protection units at a time, so that strong jets of water gushing out of the central outlet gates collide in the air and do not directly hit the river bed. This release of energy reliably prevents the undermining of the dam.

Considering the strict safety requirements, Rexroth was the only company that was able to supply an adequate, integrated system solution with its expertise and product portfolio.