Real Time Control of Combined Sewer Overflows: the SWIFT Model
Combined sewer overflows (CSOs) have been recognized as one of the major causes of poor receiving water quality in urban areas. Among the many solutions proposed to solve this problem, real time control (RTC) is one of the most promising. The objective of RTC is to minimize CSO by optimizing water volumes stored in sewer systems during rain events. This is done by using control devices (regulators) and storage tanks. Control can be local or global. An operational RTC model, the SWIFT model, has been developed and tested on the Communauté Urbaine de Québec (C.U.Q) sewer network. SWIFT is a model that uses a global strategy to define optimal regulator operations in order to minimize total overflow volume. It has been calibrated and applied to the C.U.Q network. In order to compare the efficiency of RTC using SWIFT with static control, simulations using 56 rain events from 1988 were performed on the West part of the C.U.Q network. Significant reductions of the CSO frequency and of the overflow volumes were obtained.
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