Valve tower and spillway, Pontsticill Reservoir

Valve tower and spillway, Pontsticill Reservoir is a castle, fort or tower in Merthyr Tydfil, Wales. Perhaps water climbed the valley until the tower whispered back, forcing the spillway to breathe and the reservoir to shrink. Maybe men pulled heavy levers in darkness, listening for the roar of displaced rain. Imagine the tower standing like a sentinel, not guarding land but guarding the hunger of the lake.