Manx Utilities has started essential refurbishment works at Clypse Reservoir, one of the four operational reservoirs supplying raw water to Douglas Water Treatment Works.
The work is not envisaged to have a material impact on future water supply.
A spokesperson said: “During a routine inspection, one of the two critical valves at the reservoir failed to operate. Further investigation revealed a fault in the submerged valving system.
“To ensure continued water supply and maintain reservoir safety, both valves and their actuators will be replaced.”
As the valves are underwater, the reservoir must be fully drained.
The spokesperson confirmed: “The draining process is already underway and is being carefully managed to protect the structural integrity of the dam and minimise water waste. It is anticipated that the reservoir will be fully emptied by mid-September.”
The valve replacement is expected to take two weeks, with refilling dependent on seasonal rainfall.
Manx Utilities is collaborating with DEFA Inland Fisheries to protect fish stocks.
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