The Project has a gravity dam by means of RCC construction method, which creates about 70 km long reservoir. Reservoir water will be used by two units of turbine at the powerhouse
located on immediate downstream of the main dam.
The general layout of the main dam is shown in Figure 2. The facilities around the main dam are composed of one lane of river diversion tunnel, a gated spillway, an intake structure and penstock, a surface type powerhouse, outlet facilities, related accessory equipment, etc. The dam is 148 m high and 540 m wide and the total volume is around 2.3 MCM. Further, the re-regulation dam is installed at 6 km downstream from the main dam to release the 16-hour peaking inflow from the main dam evenly on a 24-hour basis.
The river water will be diverted by one diversion tunnel driven through the left abutment, together with two cofferdams to be installed at the upstream and downstream sides of the main dam. After completion of its function as river diversion the tunnel will be permanently plugged with concrete.