On-Site Detention Systems

On-site stormwater detention systems help relieve the pressure on Councils to provide retarding basins in built up areas and on overloaded drains downstream.

When you look at the slower to construct, more expensive traditional methods, such as custom made either in or above ground tanks, a system based on standard Rocla® reinforced concrete box units, pipes and CPO™ Pits has many benefits. 

The vast range of standard sizes in pipe or box culverts sections gives multiple choices for each design situation with the knowledge of a proven product.  If necessary we can also offer other specific precast solutions.


  • Residential subdivisions
  • Commercial and industrial developments
  • Public buildings and amenities
  • Road infrastructure drainage


Brochures & Presentations