content@managingwater.co.uk Flood Barrie Bewdley: courtesy of IBS Engineering. Non-Permanent Flood Pro
Fola Ogunyoye Fola is a Technical Director at Royal Haskoning with over 20 years of experience in the management of water, flood and coastal risk. His unique blend of experience as a consultant, researcher, operations manager and contractor enables him to develop innovative, yet pragmatic solutions and guidance to the challenges at the interface between flood risk, people and the environment.
Fola has a wealth of experience in non- permanent flood protection systems and is the lead author of key industry best practice guidance in the area, including, The Temporary and Demountable Flood Defence Guide (Environment Agency, 2011) and PAS 1188 for Flood Protection Products (BSI, 2009).
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Non-permanent flood protection has been around for decades in the form of filled containers such as sand bags, part pre- installed demountable barriers such as stop logs and fully pre-installed demountable barriers such as flood gates. The last few decades has seen a significant increase of innovation in non- permanent flood protection products across Europe and the USA, at property level and strategic scales. Significant use within the UK only commenced in the past 10 years, with no recorded use during the April 1998 flood event, and very little use during the autumn 2000 floods. An increase in their deployment in the UK was noticed during the summer 2007 and more recent flood events.
Non-permanent flood protection such as the more strategic temporary and demountable flood protection systems and Property Level Flood Protection (PLP) measures provide the opportunity to reduce flood risk where permanent measures are not technically feasible, environmentally acceptable, economically viable or financially affordable. Non- permanent solutions are sometimes the only feasible structural solutions to reduce flood risk where some level of flexibility is required that cannot be provided by permanent solutions, such as managing dual use of the same space for flood protection and access.
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Temporary and demountable flood defences and PLP now form part of the portfolio of measures that the UK government promotes to manage future flood and coastal erosion (FCERM) risk. This is backed in England by Defra’s Making Space for Water and the National FCERM Strategy for England.
The Environment Agency carried has out a number of tests and trials on temporary flood products over the past 10 years, including the major trials on the Upper Severn between 2002 and 2004. In the past few years Defra has provided over £5 million grant to fund PLP measures as part of its PLP grant pilot scheme. Following these and other R&D outputs confirming the cost effectiveness of PLP for properties with high probability of flooding, Defra has now allowed for PLP to be considered alongside other FCERM measures within its new Flood and Coastal Resilience Partnership Funding Policy. This provides additional incentive for using PLP for appropriate sites.
There are four typical types of non- permanent flood protection systems:
• Temporary Barriers
are barriers which are completely deployed when flooding is forecast and completely removed afterwards
Flood Protection Barriers
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