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Coastal and river defences

sea flood defencesSea defences, Guyanariver flood defencesWeir on River Brett, UKAt Mott MacDonald we are able to offer an extensive range of services in coastal and river defences.



These range from major flood alleviation schemes to bank protection works and studies of dredging requirements.

Much of our experience has been in relation to the study, design and implementation of flood alleviation schemes in fluvial, tidal and coastal environments. However, our river and coastal engineers have also worked on river diversions, river training works, scour protection works at bridges, river amenity improvements, river flow gauging stations, coast protection and flow control structures.

The keys to our ongoing success have been the specialist expertise of our staff and our ability to build successful multi-disciplinary teams which provide comprehensive and wide ranging solutions and deliver successful projects to our clients.

Recent schemes include:
  • The River Nore where Mott MacDonald was commissioned to provide river improvements and flood alleviation through the town of Kilkenny, Ireland. Works included 2.5km of river bank retaining wall, 1.5km of flood embankment and the dredging of 250,000m3 of riverbed materials
  • Flood protection designs for the town of Brechin
  • Studies of flood protection to Inverness from the River Ness
  • Kuala Lumpur’s Stormwater Management and Road Tunnel, Malaysia. This 11km long 13m diameter tunnel is an ingenious dual-purpose tunnel carrying vehicles and stormwater – the first of its kind in the world
  • Flood mitigation studies and construction projects in Cambodia
  • A comprehensive flood information management support system for the 550,000km2 Songhua River Basin in China
  • Sea defence design and supervision in Guyana


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