Articles & Case Studies

Hereford regeneration plans secure thanks to cutting-edge flood alleviation system

Posted: Wednesday 4th April 2012

A project to reduce flooding in Hereford city centre has utilised the market leading high density polyethylene (HDPE) Weholite technology as part of a scheme that will be a UK first for its use of energy dissipation technology.

The £4.2 million Yazor Brook flood alleviation scheme involves a 1.4km long Weholite culvert, provided by Asset International Ltd (Asset), thathas been designed to divert floodwater from the Yazor Brook into the River Wye, to reduce flood risk in parts of Hereford.

The scheme, which is part of wider regeneration plans for the city, is funded by Advantage West Midlands and is being delivered on behalf of Herefordshire Council by Swansea-based Dawnus Construction. Dawnus chose Weholite, the UK’s leading technology in structured wall pipe, to construct a bespoke flood alleviation system for the project.

The unique capability of the high-density polyethylene (HDPE) pipe is that it can be manufactured in long lengths, providing a solution to the problem of building across the busy A438 Brecon Road. The construction team was able to install a single lengthof pipe across the road to complete the job over two nights, causing minimal road closure disruption to the people of Hereford.

Asset supplied 1.4km of 2.0m diameter pipes for the scheme. The project is the first of its kind in the UK to use an innovative energy dissipation chamber. This works to remove energy from the water to control the force,which is then expelled from the pipes.

Jason Austin, agent for Dawnus Construction, said: “Weholite was definitely the correct choice for this project.The expectation was that the pipes would be installed at a rate of two per day, but due to the 14m length and the fact that they are lighter and more portable, the construction team was able to install up to four pipes a day. This made the project more economical in terms of time and cost and also minimised the inconvenience caused by the necessary road closure.”

The scheme, completed several weeks ahead of schedule, will help reduce the risk of flood from a large number of properties and businesses by diverting two thirds of floodwater from Yazor Brook safely and in a controlled manner into the River Wye.

As well as time saving benefits, Weholite was also effective in terms of minimising the carbon footprint of the project. The manufacturing and transportation of the pipe equated to 252kg of Carbon per linear meter of pipe, considerably less than an equivalent concrete pipe, at 592.1kg per linear meter1.

Commenting on the project, Simon Thomas, managing director at Asset, said: “We are very proud to be part of a project as large-scale and ambitious as the Herefordshire regeneration scheme. This flood alleviation system will not only reduce the risk of flooding in this area, it will also allow for future developments to be built

“We are pleased that the versatility of the Weholite solution contributed to keeping disruption to a minimum. Helping to deliver a UK-first in terms of the energy dissipation chamber further defines us as an innovative company that prides itself on delivering tailor made solutions for the water industry.”




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