Product: Geotube® Marine Structures Technology
Application: Underwater Structures
Location: Chivor Dam, Columbia
The government built an earthen dam for hydroelectric power generation. It was discovered that a temporary diversion tunnel, used during the dam construction, was inadvertently left open. A slope failure and nearby landslides caused debris and sediments to enter the diversion tunnel [photo 2]. This began to disrupt power generation by causing excess turbine wear and vibration.
Using Geotube® marine containment technology, an underwater structure of concrete-filled Geotube® units was the key to seal off the tunnel opening. The project used a specially modified barge [photo 3]. GPS technology pinpointed the exact location for the barge to properly position the Geotube® unit. High sump, slow-set concrete was pumped into the containers [photo 4]. They were then lowered from the barge to the tunnel location.
Sonar scans confirmed the proper positioning of the concrete Geotube® units. The containers were blocking the tunnel opening [photo 6].