Coleham Head FAS, Shrewsbury

This project entailed flood alleviation works to Rae Brook and the River Severn at the location where the Coleham Head areas of Shrewsbury town centre intersect. Leading to the closure of the Coleham Head gyratory system and the English Bridge, a historic structure first constructed in 1774 and a key route into the centre of Shrewsbury, this area frequently experienced flooding.

Works comprised the construction of a flood defence wall along Carline Fields, consisting of an in-situ reinforced concrete slab with a shear key, supporting precast concrete wall units and columns at changes in wall direction, tying into the English Bridge wing wall; the erection of demountable barriers across the road adjacent to London Coleham Bridge consisting of lightweight beams that were lowered between vertical end posts cast into columns on either side of the road, and intermediate posts in the road.

The end post on the Carline Fields side of the road was cast into a special precast concrete column and the end post on the adjacent side cast into an in-situ reinforced concrete column next to the existing bridge parapet; a flood defence wall along the northern edge of Rea Brook tying into an existing flood defence wall consisting of 5m long 250mm diameter bored reinforced concrete piles supporting an in-situ reinforced concrete wall clad with brickwork. A filter drain system was constructed along the landward edge of the floodwalls consisting of a 160mm diameter plastic perforated pipe surrounded by 20mm single gravel and geotextiles. 

 
Client: Environment Agency
Value: £0.4 million
Location: Shrewsbury



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