Royal HaskoningDHV has considerable experience in all aspects of flood risk and flood alleviation, ranging from large scale coastal and river defences, through the effective management of water flow and drainage, to inspection of culverts. Our approach to flood risk management starts with understanding the natural processes at work.  A key element of any flood protection scheme, large or small, is the construction and maintenance of well designed culverts.

Culverts play an important role in channelling water and help maintain the natural direction of water flow, despite human development. Culverts can be built under roads, pathways, railways, embankments and other structures which can block the natural path of water drainage. These assets come in many shapes and sizes, from small drainage culverts found on roads and pathways, to large diameter structures on significant waterways or other engineering works.

Royal HaskoningDHV regularly undertakes detailed structural inspections of assets associated with coastal and fluvial studies, using this information to develop programmes of inspection, maintenance and replacement for our customers. Our services include:

  • Determining the extents and locations of structural defects; 
  • Assessing existing culvert capacity; 
  • Identifying remedial options to repair the asset; 
  • Considering constraints and risks associated with rehabilitation options; 
  • Determining any additional investigations required at the next (and subsequent) stages.

Our highly skilled teams included contract and financial managers, civil engineers, hydrologists and accredited Condition Asset Manual (T98 CAM) inspectors and confined space engineers. The accreditation provides the skills and knowledge to provide Environment Agency, Local Authority and Consultancy staff with the skills and knowledge to undertake a high standard and consistent approach to the visual assessment of flood defences and structures, including river, coastal and urban assets. The national accreditation course was developed by the Environment Agency and the Flood Hazard Research Centre. Training is provided by Royal HaskoningDHV.

We are also leading a research consortium to produce an update to CIRIA’s Culvert Design Manual. The new Culvert Design and Operation Guide will provide information on whole life asset management in addition to updating the hydraulic design and assessment of culverts provided in the existing guide.