Major sewer works set to close Grand Bouet

Later this summer it will shut for another five weeks while the sewer is relined.

Investigations earlier this year found the 750mm-diameter sewer to be in poor condition.

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

‘The sewer in Le Grand Bouet is a major asset within the island’s network, as one of the largest sewers on island,’ said Mark Walker, capital delivery manager.

‘It takes flows from both St Andrew’s and St Peter Port. Maintaining its structural integrity is vital to the sewer infrastructure network and continued wastewater service we provide.’

The project will cost about £500,000.

The next phase could see flows diverted into an adjacent sewer network at Admiral Park.

‘It is likely we will need to install a temporary pumping system to reduce the risk of overwhelming existing sewers within the network.’

Mr Walker said this facility would be used as a back-up to the flow diversion system and so should only be needed in an emergency.

‘However, we are cognisant of the noise implications that such a system would generate and therefore low-noise pumps and sound-proofing baffles would be used where feasible and their duration of operation kept to a minimum.’

Mr Walker added: ‘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.’

The first closure is from 3-30 June.