This paper describes the use of the sewer model HYSTEM-EXTRAN in combi
nation with a rule based control device using fuzzy-logic to simulate
the real-time control of a sewer system. The rules for the control of
the system were set up with the help of optimization procedures. The a
dvantage of the procedure is proved by comparing the uncontrolled vers
us the controlled state in a simulated mode for an existing sewer syst
em. The final system was installed and tested within the sewer system.
(C) 1997 IAWQ. Published by Elsevier Science Ltd.