Articles & Case Studies

Coping with floods

Posted: Friday 19th September 2008

On the 21st July 2007, Mythe Water Treatment Works was flooded resulting in the site being out of service for a week and leaving an estimated 150,000 residents without running water.

Once the flood waters had subsided, the engineers at Severn Trent were able to gradually restore the treatment works to working order and a limited distribution of non-potable water was reinstated. It was at this point that another flood warning for the area was issued and waters threatened to flood Mythe for a second time in as many weeks, sending Severn Trent back to square one and depriving local residents of water for even longer.

At 1500 hours on Friday 27th July, following a decision by COBRA, HESCO Bastion Ltd was contacted to provide defences using the patented Concertainer® unit. After HESCO had completed a site survey, the units were despatched immediately from HESCO’s Leeds factory and arrived on site at 2130 hours.

Planning continued throughout the evening and work began the following morning at 0700 hours. Under the expert guidance of the team from HESCO, the Armed Forces and contractors from Interserve began to construct what is now a perimeter barrier of flood defences stretching for just under a kilometre in length and standing 1.37 metres high. The teams worked using excavators, loaders and wheelbarrows to fill the units with 2400 tonnes of crushed rock aggregate, which had been delivered by a fleet of tipper trucks. In just 27 hours, the wall was complete, protecting the site from the risk of flooding before the rains came again.

Walham Switching Station

Gloucestershire, UK

In late July 2007, news broadcasts during the floods pictured Walham Switching Station perilously close to being inundated by flood water and thereby risking a loss of power to the 500,000 residents it provides with electricity.

The emergency services battled with pumps and temporary flood defences to protect the site and on Tuesday 24th July, National Grid decided to place an order with HESCO Bastion Ltd to provide more robust protection to this key facility.

The HESCO Concertainer® units arrived on site at 0800 hours on Wednesday 25th July and work began on Friday 27th July. A second flood warning meant that it was a race against the clock to protect the site as soon as possible and avert a potential disaster.

Fortunately the HESCO system is designed specifically for rapid deployment under these conditions. In just 19 hours a 1.37 metre high barrier was erected, stretching for approximately 700 metres around the site and filled with 1800 tonnes of crushed rock aggregate.

The Royal Airforce and Royal Engineers, under Captain Christian Hulme, worked alongside the team from HESCO to protect Walham with a secure defence wall, ensuring that the power remained on for local residents.

What Is HESCO Bastion Concertainer?

The materials and construction techniques used in the production of a HESCO Concertainer unit make it ideal for containing large amounts of the heavy fill material that gives the system its strength.

HESCO Concertainer units are delivered flat. A 10 metre barrier weighs only 105kg before filling, allowing easy handling on site. A single truck load will rapidly deploy to 1.6km in length, 1m effective height.

The HESCO Concertainer unit’s ability to control water egress allows it to be applied to flood defence situations, where other traditional fortification products may fail.

Tel: 0113 248 6633

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