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News Centre > Monday 20 May 2019

Le Grand Bouet to close ahead of major sewer rehabilitation

Grand Bouet closure details

Following sewer investigation works earlier this year, Guernsey Water has confirmed the necessary closure of Le Grand Bouet in June for approximately four weeks while preparations are made for essential sewer lining later this year.

The investigations found the 750mm-diameter sewer to be in poor condition. To prevent the need for a full replacement, which would come at a cost of millions of pounds and months of disruption, Guernsey Water has prioritised works to protect and extend the life of the sewer.

This closure will involve the installation of a new three metre deep manhole which will provide access along a 300m section of the sewer.

Mark Walker, Guernsey Water's Capital Delivery Manager, said: "The sewer in Le Grand Bouet is a major asset within the island's network, as one of the largest sewers on island. It takes flows from both St Andrew and St Peter Port, maintaining its structural integrity is vital to the sewer infrastructure network and continued wastewater service we provide.

"We are currently investigating the best alternative for diverting these flows while works are carried out, but it is likely we will need to install a temporary pumping system to reduce the risk of overwhelming existing sewers within the network."

The utility confirmed it is working with businesses in the area to make every effort to limit disruption, including sharing access updates across its social media channels.

Mr Walker said: "Although we appreciate repeat closures of a major road are not ideal, when compared to works that would be required for a complete sewer replacement in the future, lining represents both minimal disruption to islanders and at least 90% cost savings."

Guernsey Water is anticipating the next closure to take place later in the summer, this will involve the lining of the sewer and will last approximately five weeks, dependent on weather at the time.

Guernsey Water apologises for any inconvenience caused and will minimise disruptions as much as possible.

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