The main aim of the project was to eliminate local stormwater drainage overload, which was a barrier in the city’s development. It resulted in the creation and implementation of an innovative system of intelligently controlled impoundment that allowed to optimise available impoundment in order to minimise overflooding the system and to maximise storage capacity for the retention of precipitation to be used in-situ.
The concept was based on the assumption that the impoundment control system of the stormwater drainage system should be fed in advance with precipitation data from radar system and numerical weather prediction system. Precipitation should be forecast in real time and updated with data from rain gauges and disdrometers working in the local data collection network. Aggregate data on precipitation forecast, current precipitation distribution on urban area and water levels in basins and canals is delivered to central control unit. Using expert system, this data should be translated into a scenario for runoff control from retention basins being part of the drainage system of the city of Bydgoszcz.
Apart from central control unit SIS-RZ system will comprise several inter-connected subsystems:
- monitoring of retention tanks filling level;
- monitoring of filling levels of selected cross-sections in stormwater drainage;
- runoff control in terms of control of pumping stations or electrically controlled gate valves in reservoirs with gravitational outflow;
- precipitation nowcasting with dual data feed from precipitation forecast from a modern numerical weather system ICM and a local precipitation radar using X-band precipitation radar (modern Doppler radar with dual polarization with dedicated software);
- monitoring of urban precipitation field based on the aforementioned local precipitation radar and ground rain gauges network (electronic weighing precipitation gauge and laser disdrometers);
- monitoring basic meteorological parameters using three automatic weather stations located in different parts of the city;
- monitoring the quality of retained precipitation water that is used in-situ.