The channel separator is designed to be used in separate sewage systems. Its principal purpose is to separate contaminated surface water, such as domestic sewage from illegal connections as well as oil, grit and debris from road surfaces, from the following cleaner, rain water. The contaminated surface water is passed on to the sewer for treatment at a downstream wastewater treatment facility whilst allowing the cleaner rainwater to discharge into a watercourse.

Separate sewer systems for rainwater and sewage provide the advantage of being able to design sewer systems accurately using smaller pipes than are used in combined systems. Separate sewer systems also mean that wastewater treatment plants can be smaller as they don´t have to treat storm water as well as sewage. The storm water can be diverted direcly to the receiving watercourse.

The disadvantage of a seperate sewer systems is that two drainage systems are required. There is a danger that contaminated water containing grit & oil etc could be discharged into the receiving watercourse. It is also possible, through illegal connections, that raw sewage could also be discharged into the watercourse leading to pollution of the receiving waters.


  • removes need for storm water storage
  • low constructions costs
  • no power required
  • manual sewer flush facility (AS & SA only)
  • optional complete closure after first flush (AS & SA only)
  • easy & complete flow rate adjustment in situ (AT only)
  • 3 regulating Options
  • minimal maintenance and running costs