The Kokin Brod dam and HPP are located on the Uvac River. The dam was built in 1962. Its catchment area is 1,170 km2. The average discharge of the river is 13.9 m3/s.
The “Kokin Brod” dam is a rockfill type structure with a central clay core, 82 m high and 1,200 m long (the main part). The spillway concrete block is located on the left river bank and presents a joint between the main part of the dam, located in the river, and its auxiliary lateral part, with which the profile is closed. The dam lateral part is 25m high and 720 m long. The spillway capacity is 1,400 m3/s. Flood discharges are evacuated by the chute and ski jump into the river downstream of the HPP. The “Kokin Brod” HPP is located just downstream of the dam. A Pre-feasibility study for an increase of the generating unit capacity was completed in 2010.
The backwater of Radoinja reservoir, located downstream, reaches to the “Kokin Brod” dam; this provides the tail race water elevation required for the plant operation. Under such conditions it is not necessary to provide an additional discharge for the environmental flow. The main characteristics of “Kokin Brod” HPP with dam and other appurtenant structures are as follows :
|Total volume||250 Mm3|
|Live volume||209 Mm3|
|Normal OEL||885.0 m.a.s.l.|
|Min. OEL||845.0 m.a.s.l.|
|Type||Rock fill with central clay core|
|Crest elevation||888.5 m.a.s.l.|
|Max. head||73 m|
|Installed flow||37.4 m3/s|
|Installed power||21.4 MW|
|Annual energy||60 GWh|
|No. of units||2|
|Type of turbine||Francis|
Source: IWRM Country Report for Serbia, COWI, Stucky and Jaroslav Cerni Water Institute, 2017