A Coanda effect inlet screen is a passive, self-cleaning filtration system installed at the head of a water intake structure. It uses the Coanda effect phenomenon, where a fluid flow tends to follow a curved surface to naturally direct water across a curved wedge wire screen. This design allows water to pass through while debris, sediment, and aquatic life are excluded and swept away by gravity.
The screen’s wedge wire or Vee wire profile, made of stainless steel, is precisely engineered to provide a continuous slot opening. These openings offer exceptional strength and maximize open area while resisting clogging and wear.
Key Features and Benefits of Wedge Wire Coanda Effect Inlet Screens
1. Self-Cleaning Performance
The Coanda effect screen cleans itself naturally as water flows over it. Leaves, sticks, sediment, and organic matter are washed away by the sheer force of water and gravity, eliminating the need for backflushing or manual cleaning.
2. Low Maintenance and Long Service Life
Thanks to its stainless steel wedge wire construction, the screen is highly resistant to corrosion, abrasion, and biofouling. This makes it ideal for long-term use in rivers, streams, reservoirs, and canals.
3. Environmental Compatibility
Fish-friendly water intake is increasingly important for regulatory compliance. The Coanda intake screen is designed to minimize harm to aquatic life while maintaining high efficiency in water withdrawal.
4. Versatile Applications
Whether you are designing a hydro intake system, upgrading an irrigation intake, or sourcing a fine filtration screen for drinking water, the Coanda screen provides unmatched adaptability. It’s used across municipal water filtration, hydropower generation, and industrial surface water intake projects.
Micro-hydro power plants and run-of-river hydro systems
Irrigation canals and diversion dams
Municipal water treatment facilities
Surface water abstraction for industrial cooling systems
Aquaculture and fish hatcheries
Coanda Screen Custom Design Options
Manufacturers often provide custom Coanda effect wedge wire screen designs, tailored to site-specific requirements like flow rate, screen width, slot size, and mounting style. Options include gravity-fed Coanda filter screens, horizontal intake configurations, and fine-slot wedge wire screens for sensitive ecosystems.
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