Severn Trent Water
Heanor Breach Road Flood Alleviation Scheme
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We completed the £1m Heanor Breach Road Flood Alleviation Scheme which will reduce the flooding witnessed by numerous properties on Breach Road, Heanor. The scheme works by quickly conveying the combined sewer water away from the properties at risk of flooding and safely storing it in a 163m long 2.1m diameter tunnel. The solution is designed to limit the pass forward flows from the tunnel at 180l/s through a 30m throttle pipe which ensures the properties downstream remain safe from the flood waters. The complex hydraulic design of the scheme ensures minimal future maintenance and operates entirely without a single moving part.
The complexity of the flooding issues associated with the steeply sloping urban catchment area around Breach Road and its residential surroundings was investigated following secured funding from Severn Trent Water. Under the AMP6 framework agreement nmcn were appointed as design and build contractor and worked closely with the STW solution team to develop the best TOTEX solution for the £1m scheme.
Our drive to encourage off site manufacturing led to some of the largest Polypipe prefabricated manholes to have ever been specified. The 6m deep chambers fully fitted with pull up stainless steel ladders, bespoke benching, backdrops and inspection chambers were manufactured specifically to tie onto the jacking pipes used in the tunnel. These pioneering drive and reception pit chambers were installed in one working day which saved on programme, cost and disruption to local residents.
The Breach Road Flood Alleviation scheme’s legacy was further cemented by a collaborative approach to solving the wider flooding issues in the area. Derbyshire County Council acknowledged the lack of capacity in the existing highway network drainage to deal with overland flows during periods of heavy downpours and funding was agreed to incorporate the addition of 13 new highway gullies into the scope of the project.
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