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Flood Protection Barriers Demountable Barriers

In addition or as an alternative to permanent flood protection systems, use may have to be made of defences which remain open or have the ability to be left open during normal conditions and require part installation or operation during high water levels to form a barrier.

Reasons that a demountable flood barrier may be chosen:

• Dual use of function such as the need for access through a flood protection system.

• Unacceptable environmental impact of a permanent flood protection system.

• Management of flood risk above permanent standard of protection.

Demountable barriers are part or fully pre-installed, but requiring some operation (automatic or manual) when

flood is forecast. The big advantage is that they offer a permanent fixed solution when in place but when not required allow ‘access as usual’.

The demountable flood protection system therefore includes the temporary and permanent elements, the foundations, the seals and joints within the structure, the connections between the structure and the surface or bedding layer, the end connections and fixing details.

The demountable flood protection system also includes the operational procedures required to close the system such as mobilisation, installation and closure processes.

They include systems where pillars or supports are pre-fitted allowing barriers to simply slot into place. They may be hinged gates, or barriers that either drop or rise into place. There are also sliding barriers that usually operate on wheels in pre-set grooves.

Infrastructure and Flood R

Within England and Wales there are just over 200 operational major electricity power stations and over 400,000 substations. Of the total number of sites in England, 14% are in flood risk areas. Add to this the number of water treatment plants, the gas infrastructure and you start to get an idea as to how dependant we are on flood control measures in order to continue providing our power and clean water. A breached flood defence may result in flooding to properties, maybe hundreds of properties, but the result of flooding to a power station, water treatment works etc may impacty upon hundreds of thousands of people.

Nine nucleor sites in the UK are currently sited in flood risk areas and as flood risk increases through climate change then others may also fall into that bracket.

Sizewell B Nucleor reactor

Protecting Utility Sites from flooding

The floods of 2007 highlighted the vulnerability of the UK’s critical infrastructure when the Mythe Water treatment works was cut off by rising floodwaters and water supply to 350,000 people was cut off for up to 11days. The Walham electricity substation was also effected with 42,000 people losing power for up to 24 hours.

Following on from this event a number of reviews and reports highlighted the need to protect utility sites from flooding and a number of programmes of work were commissioned which are planned to continue until 2020 and beyond. Flood Control International is fully involved in delivering these flood mitigation programmes and is working with the majority of utility companies in the UK to provide solutions. We have been providing flood protection to these sites since 2003, when our first programme of 26 electricity substations

by Flood Control International

commenced. We have now delivered over 60 utility flood protection projects for water, power distribution and power generation companies, and the list is growing. Issues associated with utility sites are that they are often remote and unmanned, are visited by a variety of personnel and they must be secure. The number of sites, and their remote locations mean that they generally need to be left ‘flood-safe’, as there may be insufficient time to check or install flood defences once a flood alert is issued. There are two main solution types – either surrounding the entire perimeter with a concrete flood wall and gates or floodbarriers, or where this is not possible, to protect at the

Double flood door to water treatmen Combination flood gate/ demountable barrier to wide vehicle access building line. Swing floodgate to River Intake Site

Where perimeter concrete walls are chosen, our unique lightweight aluminium Lift-Hinged floodgates are chosen for vehicle accesses up to 4.5m wide. These gates are chosen as they can operate over a level threshold and do not need steps or ramps to close against. Most sites need wider accesses infrequently for transformer or large plant deliveries, and so we developed a way to integrate lift hinged gates with other gates using demountable centre posts, or demountable barrier runs making openings as wide as they


needed to be. Our gates are no stainless steel construction, giv maintenance requirement and no room to swing a floodgate, w floodbarriers that pivot upwards person operation to deploy rap Smaller pedestrian gates are u at thresholds. Our standard sol flood depths of 1.6metres, altho supplied flood gates and flood to 4.5metres where required. Many utility sites do not have th perimeter concrete wall. In thes building line with tanking and d As the condition of existing bui service entries and condition of unknown, sump pumps are nor any floodwater that does seep

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