Location of dam and HPP
“Rogacica” dam and HPP are planned at the middle part of the Drina River course, at the chainage km 173+250. The location belongs to the municipality of Rogacica; the nearest town is Bajina Basta.
Profile hydrological properties from original documentation
Basic profile hydrological properties (as given in the original technical documentation) are:
- Basin area: 15,159 km2,
- Mean discharge: 330.2 m3/s,
- Ecological flow: 60.5 m3/s,
- Flood discharge referent for design of spillways: 7,175.1 m3/s (Q0.1).
Basic dam properties are:
- Type: gravity , concrete,
- Crest elevation: 223.0 m.a.s.l.,
- Height: 42 m (construction height),
- Length along the crest: 401 m (concrete part),
- Storage evacuation structures: gated spillways, 8 fields and
- Total evacuation capacity: 9,307 m3/s (8 fields), 7,829 m3/s (7 fields).
Basic storage properties are:
- Regular water level: 220.0 m.a.s.l.,
- Maximum water level: 220.0 m.a.s.l.,
- Minimum operating water level: 218.0 m.a.s.l.,
- Total volume: not determined, negligible,
- Active volume: not determined, negligible and
- Surface area: 5.82 km2.
The plant belongs to the non-diversion type.
Basic HPP/powerhouse properties are:
- Plant type: non-diversion,
- Unit type: axial (bulb), double-regulation,
- Number of units: 4,
- Installed discharge: 4 x 200 = 800 m3/s,
- Minimum unit discharge: 50 m3/s (each unit can discharge ecological flow),
- Tailrace water level: 203.52 m.a.s.l. (at the installed discharge, 1.25 m dredging),
- Gross head: 16,48 m,
- Head loss: 0,4 m,
- Net head: 16.08 m,
- Head loss: 0.4 m,
- Installed power (active): 4 x 28.30 = 113.20 MW,
- Installed power (apparent): 4 x 33.00 = 132.00 MW,
- Mean annual electricity generation: 413 GWh and
- Connection voltage level: 110 kV.
The rated discharge was adopted primarily in the view of the capacity of the upstream “Bajina Bašta” HPP with rehabilitated units and the possible addition of a fifth unit, as well as the capacity of the downstream “Zvornik” HPP after the planned rehabilitation (replacement) of units and streamlining with a capacity increase.
(Source: IWRM Country Report for Serbia, COWI, Stucky and Jaroslav Cerni Water Institute, 2017)