The main spillway is a submerged orifice type with 9 radial gates, 36 x 40 feet each; it has a maximum capacity of 1.1 million cusecs.
22.
By using radial gates, the dam functions with an overflow, channel-type spillway allowing for a flow rate of 10, 000 cubic feet per second ( 280 m?/ s ).
23.
The tidal range is handled by the use of hydraulic sector gates at both ends of the lock, and the structure incorporates two large rising radial gates for flood control in the Bow Back Rivers.
24.
In 1949, TVA increased the dam's generating capacity and equipped the spillway with radial gates that helped extend the Hales Bar Reservoir's navigation channel all the way to the base of Chickamauga Dam.
25.
Within the station building, each turbine has a semi-embedded spiral casing, and water flow is controlled via twin radial gates installed at the entrance to each penstock and designed to cut off full flow.
26.
The new radial gates and control gear have been designed by Kgal, and because there is limited headroom, they will be built as a series of modules, each weighing less than 0.5 tonnes, which will be assembled on site.
27.
The spillway has four bays located in the middle section of the dam controlled by radial gates of 8 m x 8 m size each designed to pass a 1 in 1000 year frequency flood of / sec, which raises the water level to EL 687.42 m ( all gates open condition ) thus allowing for a free board of to top of the dam.
