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Mr Michael Wright
Dominion House
Temple Court

Northumbrian Water installs UK's first precast concrete

The UK's first precast concrete Combined Sewer Overflow, CSO in a box, has been installed at Geneva Road, Darlington, as part of a project for Northumbrian Water (NW).

The CSO, designed by environmental engineering consultants MWH and manufactured by precast concrete product specialist Hanson Building Products, was used by NW to help framework contractor Lumsden & Carrol (L&C) meet a tight AMP4 Year 1 regulatory deadline for construction of a CSO in a busy road.

The Type 5 CSO in a box was installed in less than five hours from the first lift through to the completion of base, main and weir walls. Following delivery of the static screen, the installation was completed with the addition of bespoke roof slabs. This meant that overall construction, road closure time and inconvenience to the water company's customers was numbered in days - rather than the more usual weeks - for such installations.

Speaking on behalf of Northumbrian Water, Paul Laybourne said: "Northumbrian Water are regularly looking at ways to improve processes already in place and to minimise disruption to our customers. The 'CSO in a Box' product provides flexibility to the project programme and significantly reduces overall work timescales. This type of construction method has many advantages, including the improvement to the health and safety of the construction workers. The consultants MWH and Hanson have succeeded in tailoring their solution to meet the requirements of Northumbrian Water's operations and the fast track nature of the AMP 4 schedule".

The CSO in a box concept was jointly developed by MWH engineers, Ian Lovering and Rob McTaggart, who have extensive experience of structural and sewer network design and management. They identified the potential for a standardised packaged CSO and designed a rationalised banded hydraulic solution within a pre-cast concrete, fast to install chamber. The solution can take a very wide envelope of flow and load capacity Scenaria and accommodate all recognised screen types.

Ian Lovering, MWH Principal Engineer, says; "We have specified and installed standardised chambers and tanks throughout water company AMP programmes. So it was a logical progression to complement our solutions with a precast structure that retains the design flexibility and all the benefits of conventional WaPUG-compliant designs that users are familiar with. CSO in a box can offer programme time and direct cost savings, particularly when the construction of a CSO is on the project critical path. Combined with hydraulic design standardisation we hope to see a healthy demand for this new type of CSO for the remainder of AMP4 and beyond."

Steve Walker of Hanson adds; "We believe there is great potential for this product which is why we have worked with MWH to develop the concept. In addition to offering a pre-cast concrete CSO as a stock item, it has the scope to be modified to suit 'one off' applications, of which Geneva Road is a prime example. Thus providing a quick and flexible solution to most typical CSO improvement needs for all UK based water companies".

For further information call Steve Walker on 01773 600226, email on steve.walker@hanson.biz , or mobile 07974 121783.

For further information please email MWH

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