United Utilities is creating a new underground service reservoir within an existing service reservoir.
Water company United Utilities is currently creating a new 32 mega litre service reservoir on a site in St Helens which has three existing underground service reservoirs.
Two are no longer operational and the company is utilising the space to construct a completely new service reservoir, which will serve over 60,000 homes in the area.
It is estimated that by reusing the space, construction costs will be reduced by around 75%, compared with building a brand new reservoir.
United Utilities project manager Daniel Smith said: “This really is a rare treat for us – usually our service reservoirs are full of water ready to supply our customers. But this project has meant we can get inside. It’s such a unique and beautiful space to work in.
“What is also important about this project, is by working smarter and more innovatively, we are using an existing asset to keep construction costs down, whilst still providing our customers with the highest quality of water.
“Building a new reservoir from scratch would not only cost considerable more, disruption to the local community would also be greatly increased.”
Engineers will be sealing the roof of the new service reservoir with a hi-tech membrane.
“This is all about improving the resilience of water supplies. The multi-layer intelligent membrane allows us to stop rainwater or run-off from getting into the tank and in the unlikely event the roof was ever to leak, a grid of electrical wires will be able to pinpoint the precise location and send a signal to our 24-hour control room,” added Smith.
The project will be completed by the end of 2018.