REAL-TIME CONTROL (RTC) ALTERNATIVES TO MAXIMIZE INLINE STORAGE CAPACITY OF COMBINED SEWER OVERFLOW THE QUEBEC URBAN COMMUNITY DEMONSTRATION SITE

摘要

This article presents a study of three types of Real-Time Control (RTC) alternativesrnand conventional static control, applied to the Western section of the Quebec UrbanrnCommunity (QUC) sewer system. The objective of the study is to illustrate thernmanagement performance that can be achieved through these different controlrnstrategies. In particular, the investigation aims to show the advantages and drawbacksrnof different control alternatives reported in the literature with respect to criteria such asrnthe performance, the robustness and the implementability of the proposed schemes.rnThe alternative strategies are: static control, Local Reactive Control (LRC Type 1) withrnfixed set points on the intercepted flow, Local Reactive Control (LRC Type 2) with fixedrnand variable set points located at some specific pipes, and Optimal Global PredictivernReal Time Control (OGP-RTC) with variable set points proactive to actual rainfallrnconditions.rnResults of this study show that with RTC, reductions of CSO volume vary from 24% torn46%, OGP-RTC being the most efficient. This type of RTC was chosen as the controlrnstrategy for the QUC. The first phase of the long term combined sewer overflowrn(CSO) control plan is to implement this type of control on the Western section in orderrnto maximize the intercepted flow and the use of existing facilities (two inline storagerntunnels). The complete long-term plan will include the implementation of OGP-RTC inrnthe entire system and the construction of offline storage facilities. At the end of thernlong term CSO control plan it is projected that the QUC will control more than 85% ofrnthe CSOs, for a total cost of US $107,000,000 which is 37% less than what had beenrnestimated before the introduction of OGP-RTC.rnThis study was completed as part of a demonstration project funded by the U.S.rnEnvironmental Protection Agency (EPA) for two sites, one in the Paris metro (France)rnand the one presented in this article, in Quebec (Canada). A detailed report of thisrnstudy is available through the EPA.