Comparison of measured and simulated real-time control
The historically grown sewer system of Vienna is currently being increased according to the demands of the water quality of the river Donau. The expansion plan foresees a storage volume of more than 600,000 m3 to reduce combined sewer overflow. This storage volume will be activated by real time control of large storage sewers (relief pipes) beside the Donau, Donaukanal, Wienfluss and Liesing.
To activate the storage volume, the water level or flow in the relevant pipes is controlled in real-time by slide valves, weir positions and pumping rates. The first phase of development and installation of this real-time control system is actually finished and the system went into operation in March 2005. Finally more than 25 control sites will be implemented within the whole system.
The paper describes the results of a period of 12 months were the controlled system and the uncontrolled system are compared in a simulated mode. This shows the benefit of the installation of RTC. The comparison of simulated results of the controlled systems versus the measured results of the controlled system for the first 6 months of operation allows for the quantification of the accuracy, which can be achieved in the modeling of RTC. The reasons for the differences between simulated and measured results will be explained.
