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Video | Bam-Mott JV wins £23M ‘movable weirs’ flood scheme

A Bam Nuttall-Mott Macdonald joint venture has been awarded a £23M contract by Leeds City Council for flood defence work.

The JV was set up to deliver coastal and fluvial works under the Environment Agency’s WEM (Water and Environment Management) framework.

The aim of the scheme is to provide 1 in 75 year flood protection for the city of Leeds with works extending for 4.3km from the city mainline railway station to just below Knostrop weir.

The project will see the replacement of the existing fixed weirs at Crown Point and Knostrop, with moveable weirs that can be lowered in flood conditions to reduce river levels and the threat of river flooding. This is the first time that these moveable weirs will have been installed in the UK.

An island at Knostrop Cut which separates the river from the canal will also be removed to allow the river and canal to merge. This will assist the flow of water in flood conditions. Linear flood defences in the form of walls and hard landscaping in the city centre will also be constructed.

On completion this scheme will provide the city centre with protection against a one in 75 year flood event from the River Aire and Hol Beck.

The project will take 125 weeks with a completion date of March 2017.

As technical advisor to Leeds City Council for the scheme, Arup developed the concepts, specimen designs and helped secure planning permission as well as producing the 3D flythrough.

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