Weir systems
Weir systems in the canal serve to manage the volumes caused by construction and predetermined of rain, combined sewage or sewage water in the pipe system. This happens via a weir that can be moved vertically at high speed. Its arrangement occurs possibly in specific sections after each other in the main connection to the cascading of canals or laterally to control the rainwater spillways in the retarding areas or flowing waters. Relief weirs perform flood protection as a shut-off device and optimise the relief sequence in flooded water bodies.
Cascading Weirs
Individually or connected, weirs have the task in cascades, to store sewage in canal volumes, to hold it back, and to purify the spread section using surge flushing. This way of management from present volumes in the canal system is itself an extremely cost-reducing measure as compared the extensive construction and operation of normal retarding or overflow basins.
Flush Wave Cleaning
The control electronics permanently measures the current water level in order to utilise the collected combined sewage water volume in the canal. When it rains, the weir thus regulates the storage or transfer according to the inflow. To clean out the canal network whether during dry or rainy weather individual weirs, or cascading weirs, can be controlled in combination. After the water accumulates, flush waves arise through a quick sinking of the weirs, whose energy is dependent upon the potential energy of the water and the interval of a cyclical opening and closing of the weirs. In this way, flushing waves can be produced, whose cleaning effect in practice lies significantly over the theoretical shear stress in half filled pipes. Next to the activation of canal volumes, this is an welcome windfall gain for canal operation.
