Huge OSD system quick to install

A modular Rocla® on-site detention (OSD) system provided a fast and efficient solution for Edgewood Estate residential development in Woonona, near Wollongong.

The huge OSD system can hold more than 400,000 litres. The original design was made with precast box culverts in mind. However, discussions with Rocla led to the adoption of a simpler system constructed from large diameter reinforced concrete pipes.

The 24 sections of 3000mm diameter pipes with rubber ring joints proved to be not only the most economical option, but also the fastest – an important benefit because of pressure to release the lots on to the market.

Because of site constraints, part of the system runs under a roadway – unusual for an OSD system but no problem for high-strength Rocla® pipes, which can be manufactured for highway loadings.


Project:  On-site stormwater detention

Location:  Edgewood Estate, Wollongong, NSW

Developer:  The Village Building Co.

Civil Contractor:  Glennos Construction

Engineering Consultants:  KF Williams & Associates

OSD System:  Rocla Water Quality