Model-Based Sewer Network Control - Practical Experiences

A model-based flow control system was installed at an existing sewer network. On-line radar data and radar forecasting are used to model the inflow to the sewer system. Based upon these data the model evaluates optimised flow control set-points at twelve storm-water-retention-basins in the sewer network. Flow rates of adjacent pumps and throttles are thus controlled by a central unit. The use of radar-data in discharge control systems is new and provides proper and reliable results. The overall system is now operative since more than two years. During this time, high operational stability could be achieved. The modular design also allows the addition of further elements of sewer network control. Practical experiences with the flow control system from early design to implementation in the field and ongoing operations are presented. The operation of the system significantly reduces storm-water overflows to rivers and water bodies an more storm-water is treated at the central wastewater treatment plant and retention soil filter.