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Culvert OSD provides quick fix for floods

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The City of South Perth turned an unsightly open drain into an attractive grassed reserve by installing an underground stormwater detention system constructed from Rocla® reinforced concrete box culverts.

The shallow drain at the bottom of a hill was causing flooding problems on adjacent properties in the upmarket riverside area, prompting the council to build the underground holding tank.

The system has a capacity of more than 1500 cubic metres and is designed to cope with a 1 in 50 year flood.

Rocla in Perth supplied 98 large box culverts (3600 x 2100) and 49 link slabs to construction contractor Mako Civil to build the huge three-cell detention tank, which is fed by stormwater pipes from two adjacent roads.

Unlike most on-site detention tanks, the box culverts are not inverted to create an impervious base.

The culvert legs stand on concrete footings but the base of the tank is a 200mm layer of crushed concrete aggregate that allows the stormwater to infiltrate into Perth's sandy soil.