Sefton Drive Foul Flood Relief Scheme
A specific element of our capital programme is dedicated to removing properties from the At Risk of Flooding Register. The Sefton Drive flood relief project within Maghull Merseyside, aimed to remove 31 properties from the flooding register, with six properties classed as internal and 26 as external flooding risks. Residential properties within the area were served by a network of separate sewers, ranging in diameter between 150mm and 600mm. The sewer system served a local catchment before discharging to a trunk sewer which ultimately flowed to Hillhouse wastewater treatment works.
To ensure these properties were not at risk of further foul flooding, we constructed a 5,800m3 detention tank which was 21m in diameter and depth. 900m of new sewer pipeline was laid across agricultural land, along with 50m beneath a water course and landfill site.
We also replaced 500m of pipelines in nearby roads and installed new sewage chambers to split the flow and make it more manageable.
Penketh Catchment
During 2008/09 the regulated business has entered into an undertaking to solve sewer flooding problems in the Penketh Catchment of Warrington. There are four key outputs associated with the undertaking involving capital schemes at Pyecroft Road, in Penketh North and South and for mitigation in Penketh East. The outputs are on track for delivery with the exception of Pyecroft Road, where legal delays have impacted on the milestone delivery date. The regulated business is working with its customers to resolve the issues as soon as is practicable, and as a short term measure has offered to mitigate those customers affected.
Telemetry Flood Warning System
The Dwr Cymru telemetry system is now able to detect if the sewers we manage as part of our Dwr Cymru Welsh Water contract are near to overflowing. In conjunction with our partners on the contract, Keldo, we have linked battery powered kits, which monitor levels of wastewater in sewers across Wales, to the telemetry system. The units are fitted with SIM cards which dial into our central monitoring system and send an alarm if the sewer starts to overflow. Rainfall charts obtained from the Met Office are also displayed in the system. This allows system users to determine whether an alarm has been triggered by a blockage or intense rainfall.
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