CORRELATION OF COMBINED SEWER OVERFLOW REDUCTION DUE TO REAL-TIME CONTROL AND RESULTING EFFECT ON THE OXYGEN CONCENTRATION IN THE RIVER

Real-time control of the sewer system is a frequently applied measure for the abatement of pollution caused by urban runoff in the receiving water. Although the goal is an improvement of the water quality the a ctual aim of real-time control is usually formulated as the reduction/ avoidance of combined sewer overflow. However, testing a virtual drain age system by means of a three-month rain series, hardly any correlati on between the combined sewer overflow reduction and the resulting eff ect on the oxygen concentration in the river has been found. The effic iency of real-time control for pollution abatement by means of artific ial performance criteria has to be doubted. (C) 1998 Published by Else vier Science Ltd. All rights reserved.