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rainwater. Incredibly strong and needing only

minimal cover, they are the ideal solution for

managing surface water run-off.”

Weighing only 18 kg per module and measuring

1200 mm x 600 mm x 420 mm, the modular units can

be easily lifted by hand and then laid or stacked in rows.

The units are suitable for a range of applications includ-

ing residential, commercial and industrial projects.

The modules can be wrapped in a geotextile which

allows stored water to slowly seep into the surrounding

ground and back into the water table. A more common

practice, is to wrap in an impermeable geomembrane

to create a sealed underground tank.

The sealed tank approach was adopt-

ed at the new primary school, with the

outlet from the tank then controlled to

facilitate a slow release of the stored wa-

ter back into the drainage system over a

longer period.

Manufactured from recycled plastic,

they have a high void ratio of 95% which

means that each crate is capable of stor-

ing up to 300 litres of water in the event

of heavy rains. If inspection is required

for future maintenance, then Brett Martin

can offer StormCrate Inspect Crates.

There are no limits on the use and

design of the surface over the system and they may be

successfully installed under parking areas, driveways

and landscaped areas. Ideal for domestic soakaways,

only 250mm of cover is required above the crates for

driveway applications which results in less dig and site


For more challenging applications the lorry bearing

design ensures extreme load capacity due to StormCrates

stable column structure which provides a SLW 60-bear-

ability with a 500 mm covering which represents a ve-

hicle of up to 60 t.

Brett Martin Plumbing and Drainage

Kijlstra Delivers First

CSO Chamber

To Welsh Water

Principal contractor Morgan Sindall choose Kijlstra’s

precast option for Welsh Water project and has installed

the first combined sewer overflow (CSO) chamber for

Welsh Water on a site in Maesteg, south Wales.

The 3.5 m long, 2 m wide and 2.1 m deep precast

concrete chamber was installed as part of Morgan

Sindall’s AMP6 framework contract with Welsh Water.

The works involved installation of the new precast

CSO chamber plus mechanical screen and associate

pipelines and manholes. The 17 tonne CSO chamber

was manufactured off-site and installed using a 60 tonne

capacity mobile crane.

This was followed by the two tonne internal weir

wall, grouted in place once the chamber had been po-

sitioned within its excavation.

The CSO riser unit, weighing another seven tonnes,

was then lifted into place on top of the base unit.

Preparation works in advance of the chamber’s de-

livery included construction of a 5 m x 4 m x 3 m coffer-

dam and a concrete blinding slab.

Morgan Sindall’s site agent Mark Thomas said the

precast option was chosen after careful consideration

of all the alternatives.

“We basically had three options - in-situ

concrete, a plastic chamber or precast. Precast

was the way forward for a number of reasons.”

Morgan Sindall chose the precast option to eliminate

and minimise risks associated with a traditional in-situ

pour - including working at height, steel fixing, manual

handling and concrete works.

As well as the health and safety benefits, the precast

option also saved time on the overall programme, effec-

tively reducing the 12 days required for in-situ concrete

to just one day to install Kijlstra’s factory-finished



Contractors World UK Ireland Vol 6 No 2