| Clywedog Reservoir | |
|---|---|
 Clywedog Reservoir | |
  Clywedog Reservoir | |
| Location | Llanidloes, Powys Trefeglwys, Powys |
| Coordinates | 52°29′10″N 3°37′30″W / 52.48611°N 3.62500°W |
| Type | reservoir |
| Primary inflows | Afon Clywedog |
| Primary outflows | Afon Clywedog |
| Basin countries | Wales |
| Max. length | 9.5 km (5.9 mi) |
| Surface area | 2.5 km2 (0.97 sq mi) |
| Max. depth | 66 m (217 ft) |
| Water volume | 50,000 megalitres (41,000 acre⋅ft) |
The Clywedog Reservoir (Welsh: Llyn Clywedog) is a reservoir near Llanidloes, Wales on the head-waters of the River Severn. The construction of the reservoir was enabled by an act of Parliament, the Clywedog Reservoir Joint Authority Act 1963 (c. xxxi), which asserted that "At certain times the flow of water in the river is inadequate ... unless that flow were regulated so as to ensure that at those times water in addition to the natural flow will flow down the river."[1]
- ^ Clywedog Reservoir Joint Authority Act 1963. 1963 c. xxxi, preamble para (6). Retrieved 11 June 2022..