the effluent or sewage flows from the discharge culvert through the CSO screen into the relief sewer. The contamination retained in the CSO screen is cleared by a combing movement so that it is flushed with the
sewage or effluent to the sewage treatment plant, and the shape of the comb rungs is very important in this respect. Depending on the type of works, the effluent or sewage flows horizontally, from top to bottom or from bottom to top through the CSO screen . It is important that operational reliability is ensured virtually with low
maintenance. A controlled weir wicket,

(Type RSW-K) is available for screens through which effluent or sewage ows horizontally, incidentally
the most frequently used type of screen (Type RSW). This allows throughput to be rendered dependent on the volume occurring. This also allows conclusions to be drawn as regards the quantity relieved. There is a special,
narrow screen (Type RSS) available for smaller sewers and culverts.