There will be little or no noticeable difference in the flow of Cumberland River below the dam while the lake is being raised, according to Getty. “We must maintain a minimum flow of 1,000 cfc (cubic feet per second) ... a significant amount of water,” Getty said.
There is still work to be done after the permanent barrier wall is completed. A narrower work platform on the upstream side of the dam will remain after the project is done. The platform, created to accommodate equipment to repair the dam, is currently being reduced from 75 feet wide to 55 feet, Getty noted.
Getty said buttress stone will be placed against the temporary wall on the back side of the work platform. It will leave a 30-foot-wide permanent platform across the upstream side of the dam, he said.
Completion of the rehabilitation project and a rise in the water level will end six years of low lake levels that depressed a local economy already hurting from a nationwide recession. Engineers say the repairs on the dam will permanently stop uncontrolled seepage that in 2005 resulted in the structure being declared in high risk of failure.