The cost to separate the combined sewer system into a sanitary and stormwater system is very high. If there is an opportunity to separate the system during other sewer renewal work and where there are few other options to reduce flooding sewer separation may be undertaken. The combined sewer system is more than 25 meters below ground making it very difficult to fully separate. EPCOR is moving towards achieving the environmental equivalent to full sewer separation through investing on improvements that will provide the most benefit to the system.
For more information you can visit our Stormwater Integrated Resource Plan webpage for details on how EPCOR is planning to use green infrastructure to slow stormwater from entering the system and reduce CSO events.