Abstract
The application of real time control (RTC) to wastewater systems may be useful if both operational problems exist and idle capacity is available. One of the more frequently applied RTC techniques in combined sewer systems (CSS) is the activation of in-line storage capacities by positioning regulators such as moveable weirs and gates into the collectors. If adequately controlled, these regulators can improve the system response during storm events eventually providing both improved flow control and significant overflow reduction. This paper presents the results of the application of RTC by using an advanced hydraulic model. Both local and global strategies for the control of moveable weirs are investigated. A simple two-step procedure to fix the weirs setup in the system and an application to the Roma–Cecchignola CSS are presented. Based on obtaining the maximum activated storage capacity, the procedure can easily be extended to any other CSS. Comparison of the results obtained with the tested strategies has shown that, according to other authors' results, a global control strategy allows for reducing overflows considerably more than a local control strategy.
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