These were works to install bespoke flood alleviation drainage along Dale Road, Coalbrookdale in Shropshire. Working with our client Balfour Beatty on behalf of Telford & Wrekin Council, this £400,000 project was completed over 13 weeks and was designed to reduce the dual risk of flood water from a nearby brook and the River Severn closing the road and affecting homes and businesses.

We installed a specialist non return valve within the existing brook wall at the outfall location (WaStop inline non return valve) with 1050mm diameter and 900mm diameter pipework installed within the existing carriageway. The specific gradient will hold water back when necessary but release to the outfall brook in times of overload. We also constructed 2 manholes with sumps to enable additional pumping if required.

The two main catchment areas were covered using bespoke turret gully pipes designed to remove water from the carriageway. The deepest pipes were 1050mm diameter at 5m and 900mm pipes which started at 5m running up to 2.5m in the shallowest areas.

During construction many obstacles were encountered, including the existing 600mm diameter foul sewer (900mm pipes past under this), existing 4 way BT ducting system, gas, water and electric mains and individual services, an old existing brick culvert along with a 225mm foul sewer coming from the nearby school.

All trenches were backfilled with foam concrete to ensure minimal settlement and to fill any unexpected voids that were encountered during the works.

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