“Višegrad” dam and reservoir are located on Drina River (stationery km 245+000). The main structures were built in the 1985–1989 period. “Višegrad” dam is a concrete dam, 79.5 m high and 280 m long.
Appurtenant structures comprise the following: gated spillway with the maximal capacity of 6,000 m3/s, bottom outlets with the maximal capacity of 5,000 m3/s and stilling basin. Powerhouse is located next to spillway part. In the powerhouse are installed three generating units, with total power of 345 MW.
The environmentally guaranteed flow is 50 m3/s.
During its previous operation this HPP has proved its reliability and worked almost without any major defects. During the last two years have been performed complex rehabilitation works whose objective was to reduce seepage beneath the dam. Based on the results obtained in October 2014, water loss caused by seepage was reduced by approximately 70%.
The main characteristics of the “Višegrad” HPP with corresponding structures are presented below (Mm3 = millions of cubic metres; m.a.s.l = metres above sea level):
|Total volume||161 Mm3|
|Live volume||105 Mm3|
|Max. OEL||336 m.a.s.l.|
|Normal OEL||333-336 m.a.s.l.|
|Min. OEL||319 m.a.s.l.|
|Type||Concrete – gravity|
|Crest elevation||339 m.a.s.l.|
|Max. head||44.4 m|
|Installed discharge||800 m3/s|
|Installed power||333 MW|
|Annual electricity production||1,010 GWh|
|No of units||3|
|Type of turbine||Kaplan vertical|
Source: IWRM Country Report for B&H, COWI, Stucky and Jaroslav Cerni Water Institute, 2017