Comparison of Two Methods of End-of-Pipe Control for CSO and Stormwater

Control and treatment of stormwater discharges and combined sewer overflows (CSO) from w•ban areas are issues of increasing importance in the field of water quality management.The City of Toronto has identified water quality problems resulting from these discharges and has undertaken to develop a Sewer System Master Plan for the virtual elimination of CSO and the control/ treatment of stonnwater runoff prior to discharge to receiving waters.The CSO outfalls contribute approximately 71% of average annual volume and the stonnwater outfalls 29%.It has been detennined that for the City of Toronto the most effective means of controlling the CSO problem is to intercept CSO in a storage facility and then direct the intercepted CSO to a treatment facility at an Conetta, M., W. Wichmann and M. Parente.1994."Comparison of Two Methods of End-of-Pipe Control for CSO and Storm water."Journal of Water Management Modeling R 176-20.