Design and installation of aeration systems for hydropower, water supply reservoirs and other applications
J. Strom Thurmond Reservoir, South Carolina
J. Strom Thurmond Dam
Also know as the Clarks Hill Dam
Built between 1946 and 1954 by the U.S. Army Corps of Engineers on the Savannah River
Concrete-gravity dam flanked by embankment dams, with the concrete structure spanning 1,096 feet and rising 204 feet tall
Located in Columbia County, Georgia and McCormick County, South Carolina, Lake Thurmond has a surface area of 71,100 acres
The JST Power Plant has 7 turbines with an installed capacity of 380 MW
JST Fish Habitat Mitigation System Design Goals:
Purpose: Provide striped bass habitat Where: Lower 8 miles of JST Reservoir Layer: 18 - 24 degrees celsius When: June - September (low DO season) Aerated Zone: 5 mg/L for 1 mile (no less than 4.5 mg/L) 4 mg/L for 4 miles (no less than 3.5 mg/L) Releases: 3 mg/L (before turbine aeration) Restrictions: Diffusers no higher than elevation 275 ft. (83.8m)
A diffuser system, consisting of nine lines spread out over four elevations, was installed at the J. Strom Thurmond Reservoir as part of a litigation agreement to mitigate fish habitat that was being impacted by operation of the hydropower pump back units located upstream at the Richard B. Russel project.
After years of efforts to solve fish entrainment issues, the pump back units at RBR were approved for operation in 2001. With this approval, the USACE agreed to limit pump back operations at RBR to 2 units out of 4 until a fish mitigation system was implemented.
The JST oxygen system is designed to place oxygen in the reservoir at the specific temperature range suitable for striped bass habitat, as well as to enhance dissolved oxygen (DO) levels at the dam.
The 9 line diffusers are supplied with pure gaseous oxygen from a liquid storage and supply facility
Liquid oxygen is trucked to storage tanks onsite
Vaporization of oxygen provides the pressure to move the gas through the diffusers
JST oxygen supply facility is capable of 3,600 scfm (over 200 tons) of oxygen per day
Nine diffusers were installed at JST about five miles upstream of the dam
The diffusers are as much as a mile from the oxygen supply facility
The diffusers are installed at four elevations chosen to place oxygen in the 18 to 24 degree Celsius range during the summer months
Extensive monitoring and testing in 2011 showed the oxygen system capable of meeting all design goals("Oxygen System toCreate Fish Habitat and Enhance Hydropower Water Quality at the JST Reservoir"). Initial results from fish tracking studies indicate increasednumber ofstriped bass in the new habitat("Distribution of Striped Bass in JST Reservoir, South Carolina - Georgia, in Relation to Pump Storage Operation and Hypolimnetic Oxygenation").
Reservoir profiles in 2012 show project goals being maintained: