Function

The CSO screen RSW-K, fitted vertically between the discharge culvert and the relief sewer, reliably retains all visible solids > 4 mm when the excess water flows through horizontally. It is mounted on the owner‘s prepared concrete sill. The height of the sill depends on the hydraulic survey. Type RSW-K is a combination of Type RSW and a controlled weir wicket, but the basic functions of the CSO screen are identical. The relief height can now be controlled on Type RSW-K with a control function. The weir wicket is controlled by two hydraulic cylinders. The aim of the control function is to discharge as little contaminated rainwater as possible into the relief sewer. 
This works as follows: In basic position, the weir wicket is closed, i.e. no effluent or waste water can flow into the relief sewer. If the water level at the inlet end has reached a predetermined height, the weir wicket starts to open. level probe which allows various level heights to be measured generates the signal. An optimum position of the weir wicket then corresponds to each signal. This achieves minimum discharge into the relief sewer. Cleaning is also performed by the cleaning carriage analogously. 
Quantity measurement option: A second level measurement system at the relief end and the fact that the position of the weir wicket is known by the displacement measurement system allows the relief rates to be detected, totalled and recorded permanently.

ROMAG CSO screen RSW-K, 14x8/4 for WWTP Telli at Aarau Switzerland