Coanda-effect static self-cleaning screens — an inclined wedge-wire surface with no moving parts that uses the Coanda effect to draw water through fine slots while shearing debris, sediment and fish over the top.
Intake Screening for Water & Desalination Plants
A Coanda screen is an inclined, curved wedge-wire surface over which water flows; the tilted wires and the Coanda effect shear a thin layer of water through the fine slots (often under 1 mm) while debris, sediment and fish are carried across the surface and over the edge. With no moving parts and no power, it is self-cleaning and highly effective at fine-debris and sediment exclusion.
Named after the Coandă effect (Henri Coandă), these static self-cleaning screens were commercialised from the 1980s–1990s for small-hydro and water-supply intakes. Their ability to exclude fine sediment, debris and fish with no power or moving parts made them a favourite for run-of-river and mountain intakes.
Configurations in service
Accelerating curved surface maximises the Coanda shearing of clean water.
Wires tilted into the flow slice off a thin clean layer; sub-mm slots.
Drop-structure intakes for run-of-river and mountain supplies.
Debris, sand and fish pass over the deck rather than through it.
An honest engineering assessment
Typical applications
Coanda static screens suit run-of-river and small-hydro intakes, mountain and gravity water supplies, and fish- and sediment-sensitive abstractions where a passive, self-cleaning fine screen is wanted.
The full intake-screen series
A companion intake-screen type — design, history and trade-offs.
Read MoreA companion intake-screen type — design, history and trade-offs.
Read MoreA companion intake-screen type — design, history and trade-offs.
Read MoreA companion intake-screen type — design, history and trade-offs.
Read MoreA companion intake-screen type — design, history and trade-offs.
Read MoreA companion intake-screen type — design, history and trade-offs.
Read MoreA companion intake-screen type — design, history and trade-offs.
Read MoreA companion intake-screen type — design, history and trade-offs.
Read MoreA companion intake-screen type — design, history and trade-offs.
Read MoreThe screening stage of the seawater intake series.
Read MoreIntake design integrated with SWRO pre-treatment.
Read MoreThe full seawater intake hub — structures, fouling, materials.
Read MoreBar, band and drum screens across our range.
Read MoreOur engineers select and size intake screening — coanda static and the full train — matched to your debris load, fish-protection duty and downstream process.
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