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New stormwater storage for Severn

Severn Trent’s West Midlands’ River Tame catchment will enjoy improved water quality following construction of a new stormwater storage tank.

The Willenhall Unsatisfactory Intermittent Discharge project will reduce annual sewage overspills to the River Tame by more than 75%, from 153,000m³ to just 33,000m³.

It involves the construction of a 20,000m³ below-ground reinforced concrete storm sewage storage tank


The tank is subdivided into 12 separate tanks, which will fill sequentially during heavy rain and be emptied by pump-return once the flows in the receiving Black Country Trunk Sewer have subsided.

Computational fluid dynamics were used to gain an understanding of the behaviour of particulate matter within the tanks, which informed efficiencies in the filling regime and cleansing mechanism to be used.

Design and build contractor North Midland Construction and designer Eastwood & Partners have included a glass-reinforced plastic cover on the completed tank design.

The contract was let on a target price basis, at a cost of £7.6M, with a completion date of May 2011.

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