Garreg Ddu dam, Elan valley, Powys, Wales, UK
The Garreg Ddu dam in the lower Elan Valley is a low, completely submerged dam which maintains a constant supply of water to Birmingham by holding water back on the upstream side so that water can be extracted at the Foel Tower to allow gravity feed to Birmingham. .
It also supports masonry pillars carrying the access roadway to the neighbouring valley of the River Claerwen. The original road leading to this valley was to be lost, along with many original buildings, when Caban Coch dam was completed and the Claerwen and Elan valleys were flooded.
Garreg Ddu dam, Elan valley, Powys, Wales, UK
The Garreg Ddu dam in the lower Elan Valley is a low, completely submerged dam which maintains a constant supply of water to Birmingham by holding water back on the upstream side so that water can be extracted at the Foel Tower to allow gravity feed to Birmingham. .
It also supports masonry pillars carrying the access roadway to the neighbouring valley of the River Claerwen. The original road leading to this valley was to be lost, along with many original buildings, when Caban Coch dam was completed and the Claerwen and Elan valleys were flooded.