The Copa® Cross Wave Screen is designed to be installed at any CSO location, whether below ground or into an existing storm overflow chamber. The perforated plate provides a physical barrier in the path of the flow, retaining gross solids to 6mm Diameter in 2 dimensions.


Applications

The Copa® Cross Wave Screen applications include storm tank discharges, emergency overflows on pumping stations, storm weirs on a sewage treatment works and overflows within the sewerage system. The screen is ideal for both retro-fit and new Storm overflow chambers.


Operating Principle

The Cross Wave is typically installed horizontally at 90 degrees to the overflow weir with upward flow through the screen. The unique curved wave shape of the screen along with the electro-polished surface aid the ’drop off’ of screening material as the water level within the chamber falls.


Maintenance

The smooth profile, which is electro-polished to remove all sharp edges, is designed to enhance screenings ‘drop off’ whilst allowing the trough of the wave to remain clear. It should be stressed that as with all static screens it is important to routinely backwash the screen. This will prevent the gradual build up, over time, of matter on the underside of the screen. Back-washing frequency is very site dependant and should be ascertained over time.

The backwashing can be undertaken either automatically or manually. The use of a spray bar or sparge system above the screen or the positioning of the screen under a tipping bucket used to clean a storm tank can achieve automatic cleaning.


Advantages

• Non- powered
• No mechanical cleaning or scraping devices
• Easy to retrofit in to any shape or size chamber
• Easy to maintain

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