A Coanda intake screen is a passive, self-cleaning water screening device that uses the Coanda effect (a fluid dynamics principle where a liquid jet follows a curved surface) to separate debris, sediment, and aquatic organisms from water while collecting clean water through precision-manufactured wedge wire slots. Requiring no external power, no moving parts, and minimal maintenance, Coanda screens have become the preferred intake technology for hydropower plants, municipal water systems, irrigation diversions, and snowmaking facilities worldwide.
If you have ever watched water curve along the back of a spoon under a kitchen faucet, you have witnessed the Coanda effect. In a Coanda intake screen, that same principle is applied on an industrial scale: water adheres to tilted wedge wire surfaces while gravity and fluid momentum carry debris off the screen face without blocking it.
This guide covers every aspect of Coanda screen technology: the physics, the design of each component, practical applications, and advice on selecting a screen. ADENCO's engineering team wrote it from the manufacturer's perspective.
Table of Contents
- The Coanda Effect: The Physics Behind the Screen
- Anatomy of a Coanda Intake Screen
- How a Coanda Screen Works: Step by Step
- Key Design Parameters
- Materials and Construction
- Applications
- Advantages of Coanda Screens
- Limitations and Design Considerations
- Coanda Screens and Fish Protection
- Frequently Asked Questions
- References
The Coanda Effect: The Physics Behind the Screen
The Coanda effect is named after Romanian aerodynamicist Henri Coanda, who first observed the phenomenon in 1910 during experiments with his Coanda-1910 aircraft. He noticed that exhaust gases from the engine clung to the fuselage surface rather than flowing freely into the air. Coanda later described the discovery formally in his 1934 French patent for a "method and apparatus for deviation of a fluid into another fluid" [1].
In fluid dynamics, the Coanda effect describes the tendency of a fluid jet to adhere to a nearby convex or flat surface rather than traveling in a straight line. When a fluid jet flows along a curved surface, it creates a low-pressure zone between the jet and the surface. The surrounding higher-pressure fluid pushes the jet toward the surface, so the jet stays attached to the surface along the curve.
In the context of water intake screens, the Coanda effect appears in a specific and useful way: as water flows over a curved screen surface composed of tilted wedge wires, the water follows the surface of each wire, bending around its leading edge and passing through the slot opening between adjacent wires. This attachment behavior dramatically increases the amount of water that can be collected through very narrow slot openings: far more than simple gravity flow through a flat screen would allow.
The US Bureau of Reclamation (USBR) has identified three dimensionless numbers that determine Coanda screen hydraulic performance [2][3]:
- Froude number (Fr): the ratio of inertial forces to gravitational forces; it determines the flow velocity across the screen face
- Reynolds number (Re): the ratio of inertial forces to viscous forces; it determines whether flow through the slots is laminar or turbulent
- Weber number (We): the ratio of inertial forces to surface tension forces; it affects flow capacity, particularly at small slot widths
Wahl's 2021 research demonstrated that the flow capacity of Coanda screens depends primarily on Froude and Weber numbers but is largely independent of Reynolds number and viscosity: a finding that simplifies design calculations considerably [4].
Anatomy of a Coanda Intake Screen
A Coanda intake screen consists of five key components, each designed to work together as a unified hydraulic system. Understanding these components is essential for selecting the right screen and getting the best performance from it.
1. Weir Crest
The weir crest is the topmost element of the screen structure. Raw water flows over the weir crest before reaching the screen surface. The weir crest elevation determines the hydraulic head available to push water through the screen and establishes the design flow capacity. The shape of the weir crest turns the free-falling water into a smooth, accelerated flow across the screen face.
2. Acceleration Plate
Immediately downstream of the weir crest, the acceleration plate serves a critical function: it smoothly accelerates the incoming water and delivers it tangent to the screen surface at the correct velocity and angle. The acceleration plate typically follows an ogee-shaped (S-curved) profile (the natural trajectory of a free-falling jet under gravity) or a simple circular arc [2].
This shape is optimal because it matches the parabolic trajectory water would naturally follow as it falls over the weir. This eliminates flow separation and turbulence at the transition from weir to screen, ensuring uniform contact between the water and the screen surface. A poorly designed acceleration plate causes air gaps and flow separation, and it reduces screen capacity.
3. Wedge Wire (V-Wire) Screen Panel
The heart of a Coanda screen is the wedge wire panel. Wedge wire is also called V-wire. Unlike round wire or perforated plate, wedge wire has a triangular (V-shaped) cross-section with the wide flat face on the flow side and the narrow edge pointing away from the flow. This geometry provides three critical advantages:
- Slots that do not clog: The V-shape creates slots that widen in the direction of flow. Any particle that enters a slot will pass through rather than becoming stuck.
- A stiff, strong wire: The triangular cross-section provides excellent rigidity and resistance to bending, even over long unsupported lengths.
- An accurate slot width: The manufacturing process keeps the slot width within a tight tolerance, typically ±0.1 mm, so the screen reliably excludes particles above the chosen size.
Typical wedge wire dimensions for Coanda screens include a wire width of approximately 1.5 mm and a wire depth of approximately 3 mm, though these vary by manufacturer and application [5][6].
4. Wire Tilt Angle
Each individual wire in the screen panel is tilted a few degrees so that the leading edge protrudes slightly into the flow. This tilt creates a small shearing offset at each slot: a step that physically shears a thin layer of water from the bottom of the flow at every wire.
The standard wire tilt angle is 5 degrees. Most manufacturers offer 3° to 6°, and 7° is the practical upper limit: above about 7° the flow separates from the wires and the Coanda effect is lost [2][7]. ADENCO manufactures from 3° to 7°. The tilt angle creates a dual flow mechanism:
- Orifice flow component: Water passes through the slot opening as a function of hydraulic head (water depth) above the screen and the slot width.
- Sheared flow component: The tilted wire offset physically separates a layer of water from the main flow, regardless of the water depth above the screen. This component is proportional to the offset height and the velocity across the screen face.
This dual mechanism is what gives Coanda screens their remarkably high flow capacity relative to their size. The sheared flow component collects water that would otherwise simply flow over a conventional flat screen [2][3].
5. Collection Chamber and Support Structure
Below the screen panel, a collection chamber receives the screened water and directs it to the outlet pipe or channel. The support structure holds the screen panel at the correct curvature and angle, typically incorporating a concave arc with a radius of curvature of approximately 3 metres (10 feet) [5]. Some sites use flat screen panels where the site geometry or a limited hydraulic head requires it.
How a Coanda Screen Works: Step by Step
Understanding the complete flow path through a Coanda intake screen reveals why this technology is so effective.
Step 1: Water Approaches the Weir
Raw water from a river, creek, reservoir, or canal approaches the weir structure. The weir crest establishes the upstream water level and controls the volume of water that will flow over the screen.
Step 2: Flow Over the Acceleration Plate
Water spills over the weir crest and flows down the acceleration plate. Gravity accelerates the thin layer of water, increasing its velocity as it descends. The plate's S-curved shape keeps the water in contact with its surface: there is no air gap or flow separation. By the time water reaches the top edge of the screen panel, it is flowing at a uniform velocity and is tangent to the screen surface.
Step 3: Shearing and Collection at Each Wire
As the accelerated layer of water reaches the first tilted wedge wire, two things happen simultaneously:
- The Coanda effect causes the flowing water to follow the curved surface of the wire, bending around the leading edge.
- The wire tilt offset physically shears a thin layer of water from the bottom of the flow, directing it through the slot opening.
This dual action (Coanda adhesion plus mechanical shearing) repeats at every single wire across the screen face. At each slot, a small fraction of the total flow is diverted through the slot into the collection chamber below.
Step 4: Debris Rejection and Self-Cleaning
Particles larger than the slot width (sediment, leaves, twigs, aquatic organisms) cannot pass through the slots. Instead, these materials remain on top of the screen face and are carried along by the remaining water flow and gravity. The curved geometry and the momentum of the flow ensure debris slides off the downstream edge of the screen into a bypass channel, returning to the natural watercourse.
This is the self-cleaning mechanism: no brushes, no backwash pumps, no compressed air, no moving parts. The same flow that brings debris to the screen also removes it.
Step 5: Screened Water Collection
Clean, screened water accumulates in the collection chamber beneath the screen and flows under gravity, without pumping, to the downstream pipeline, treatment plant, penstock, or storage facility.
Key Design Parameters
Selecting a Coanda screen correctly requires careful attention to several interdependent parameters. The USBR Coanda Design Guide (Wahl, 2003, report R-2003-03) [2] and the associated software tools [8] provide engineers with proven calculation methods.
Slot Width (Slot Opening)
Slot width determines the maximum particle size that can pass through the screen. Common ranges include:
| Application | Typical Slot Width |
|---|---|
| Fish exclusion (larvae) | 0.5 – 1.0 mm |
| General debris screening | 1.0 – 1.5 mm |
| Coarse pre-screening | 1.5 – 2.0 mm |
Narrower slots provide better filtration but reduce flow capacity per unit area. Slot widths as narrow as 0.2 mm are technically feasible, though rarely required for intake applications [5][7].
Screen Inclination
The overall screen panel is mounted on the downstream face of the weir at anything from 10° to 60° from horizontal, which is the range the USBR Coanda Design Guide covers [5]. Flatter screens pass more water per metre of width, because more of the flow is orifice flow, which depends on the depth of water above the screen. On steeper screens the flow shears more strongly across the screen face, which is what keeps them free of debris. ADENCO usually chooses the steeper part of this range, typically 40° to 60°: a screen that stays clean during a sudden debris load is worth more than a few percent of extra calculated capacity.
Flow Capacity
A well-designed Coanda screen delivers approximately 140 litres per second per metre of weir width (140 l/s/m) under typical operating conditions [9]. This is a generic industry baseline for the USBR reference geometry; ADENCO's own series have rated capacities of 35 l/s (ADENCO-45), 67 l/s (ADENCO-70) and 150 l/s (ADENCO-127) per metre of screen width, depending on the screen's drop height: see the products page for model-specific sizing. As a planning baseline, 140 l/s/m means:
| Design Flow Required | Approximate Weir Width Needed |
|---|---|
| 50 l/s | 0.36 m |
| 100 l/s | 0.71 m |
| 500 l/s | 3.57 m |
| 1,000 l/s (1 m³/s) | 7.14 m |
The real capacity depends on the available head, slot width, tilt angle, screen length, and water properties (temperature, surface tension, sediment load).
Head Loss
The total head loss between the weir crest and the base of the screen is given in the published literature as a typical range of 450 mm to 1,300 mm [9]; ADENCO's standard screens have drop heights of 450, 700 and 1,270 mm, and custom screens can be built with a larger drop. This built-in requirement for hydraulic head means Coanda screens are best suited for sites with adequate natural elevation difference: they are not appropriate for low-head or pumped intake situations where every centimetre of available head is critical.
Screen Length
Screen length (measured along the flow direction) determines the total number of wire slots and therefore the total capacity. Longer screens collect more water but use up more hydraulic head. The USBR computer program calculates the optimal screen length for a given set of design parameters [2][8].
Materials and Construction
Stainless Steel Grade Selection
Coanda screens are constructed from stainless steel wedge wire, with the grade selected based on water chemistry:
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AISI 304 / 304L: The standard choice for freshwater applications. Provides excellent corrosion resistance in water with chloride concentrations below 200 ppm and temperatures below 60°C. Critical Pitting Temperature (CPT): approximately 40°C at 300 ppm chloride [10].
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AISI 316 / 316L: Required for brackish water, coastal environments, or any application where chloride levels exceed 200 ppm. The 2–3% molybdenum content significantly improves resistance to chloride-induced pitting and crevice corrosion. CPT: approximately 70°C at 500 ppm chloride [10].
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Duplex and super duplex grades: Chosen for corrosive environments such as seawater, industrial wastewater, or high-temperature applications where even 316L is insufficient.
Pickling and Passivation
All welds are pickled and passivated after fabrication. Welding leaves a heat-affected zone. In this zone the chromium oxide layer, which gives stainless steel its corrosion resistance, is damaged, and the weld also leaves scale and embedded contaminants. Pickling removes that damaged layer chemically and passivation rebuilds it, returning the weld area to the corrosion resistance of the parent metal. This is standard on every screen, not an upgrade.
In snowmaking applications, specialized anti-icing treatments can prevent the formation of frazil ice (small ice crystals carried in flowing water) on the wire surfaces.
Quality Control
Precision in slot width is essential. Manufacturing tolerances of ±0.1 mm are standard for quality wedge wire production. Each screen panel undergoes dimensional inspection to verify slot width uniformity across the entire panel.
Applications
Coanda intake screens are used across a wide range of water management sectors. Their passive operation, fine screening capability, and self-cleaning properties make them versatile across industries.
Hydropower
Coanda screens are widely used at hydropower facilities, particularly at small to medium-head hydropower plants. Over 40 Coanda screens have been installed at European hydropower sites, mainly in the Alpine regions and the United Kingdom [9]. At Lodore Falls in the UK (170 kW), the installed Coanda screen increased annual energy production by 15%, because manual screen cleaning was no longer needed, with a payback period of approximately two years [9].
ADENCO's largest project at a single site is Gongele HPP (hydropower plant) in Antalya, Türkiye: 28 ADENCO-127 screens on one intake, 4,424 l/s. The project shows what an array can do that a single panel cannot: capacity is added by repeating a proven unit rather than by operating one screen above its rated capacity, and the complete intake documentation package (design report, hydraulic sizing, drawings) was approved by the water authority without changes. See the Gongele HPP case study for the array layout and installation photographs, or the hydropower applications page for how a model is chosen to match a project's flow and drop height.
Municipal Water Supply
For drinking water and potable water intakes, Coanda screens provide first-stage screening that removes debris, sediment, and biological matter before downstream treatment processes. Running without electricity, they reduce both operating costs and carbon emissions.
Agricultural Irrigation
Irrigation systems (particularly drip irrigation) require clean water to prevent emitter clogging. Coanda screens provide reliable pre-filtration at canal or river diversions, protecting downstream filters and distribution systems from sediment and organic debris.
Snowmaking
Ski resorts require large volumes of clean, filtered water for snowmaking. Approximately 0.5 m³ of water is needed to produce 1 m³ of machine-made snow [11]. Contaminants such as pine needles, leaves and sediment can clog snowmaking nozzles and damage equipment. Coanda screens provide the necessary pre-filtration, and their passive operation is ideal for remote mountain locations where the electricity supply is limited or unreliable.
Wastewater Pre-Treatment
Inclined static wedge wire screens (sidehill screens) that work on the Coanda principle are used for preliminary solids removal in wastewater treatment, achieving 30–60% suspended solids removal and up to 20% energy savings in downstream aeration [12].
Advantages of Coanda Screens
No Moving Parts
The entire screening process is powered by gravity and fluid dynamics. There are no motors, bearings, seals, gearboxes, or chains to maintain, lubricate, or replace.
No External Power Required
Coanda screens operate as purely passive, gravity-fed devices. This eliminates electrical infrastructure costs, reduces operating expenses to near zero, and makes the technology suitable for remote or off-grid locations.
Self-Cleaning
The combination of water velocity, gravity, and curved screen geometry continuously sweeps debris off the screen face. Under normal operating conditions, no manual cleaning is required.
Fine Screening Capability
With slot widths as small as 0.5 mm, Coanda screens can exclude fine sediment, small aquatic organisms, and debris that would pass through conventional bar screens or trash racks.
High Capacity
The dual orifice-plus-shearing flow mechanism delivers significantly higher flow per unit area than conventional flat screens. The USBR reference geometry gives 140 l/s per metre of weir width as the published industry baseline, and the ADENCO-127 has a rated capacity of 150 l/s per metre. Either figure means a compact intake.
Long Service Life
With no moving parts and construction from marine-grade stainless steel, Coanda screens routinely deliver up to 25 years of service with minimal maintenance.
No Electricity, No Chemicals, No Noise
No power consumption means zero operational carbon emissions. No chemical treatments are required, and there is no noise pollution at the intake. Because the screen is a static structure with no suction and no moving parts, it can be supplied to meet EA, NMFS or DWA fish protection criteria, with slot width and slot velocity selected for the species and life stage present at the site.
Limitations and Design Considerations
An honest engineering guide must also state when a Coanda screen is not the right choice. Understanding these limitations helps engineers select the optimal intake technology for each project.
Head Requirement
A Coanda screen needs enough available head between the weir crest and the screen base to accommodate its drop: ADENCO's standard screens have drop heights of 450, 700 and 1,270 mm, and custom screens can be built with a larger drop. Sites with little elevation difference between the upstream water level and the intake may not have enough head for a Coanda screen to operate effectively. In these situations, pumped intake screens or submerged cylindrical screens may be more appropriate.
Extreme Sediment Loads
While Coanda screens cope with normal sediment loads through their self-cleaning mechanism, extreme flood events with very high sediment concentrations can temporarily overload the screen. Proper hydraulic design (including bypass channels and flood diversion structures) reduces this risk.
Frazil Ice in Extreme Cold
In very cold climates, supercooled water can form frazil ice crystals that adhere to screen wires and reduce or block flow. Countermeasures include heated screen systems, recirculation of warmer water, and air bubble curtains [13][14]. ADENCO offers its own anti-icing systems for intakes in cold climate zones.
Not Suitable for All Flow Ranges
Coanda screens are optimized for a specific design flow range. At very low flows, the layer of water may not accelerate sufficiently across the screen face to maintain the Coanda effect and self-cleaning action. Sites with extreme flow variability may require multi-panel arrays or adjustable weir crests.
Coanda Screens and Fish Protection
Fish and aquatic organism protection is increasingly critical for water intake design. Regulatory frameworks worldwide mandate specific intake screen performance criteria:
- U.S. Clean Water Act Section 316(b): Requires intake velocity below 0.5 fps (0.15 m/s), impingement mortality below 24%, and screening to exclude organisms [15][16].
- EU Water Framework Directive: Establishes ecological status requirements for water bodies affected by water abstractions (withdrawals) [17].
- UK Environment Agency: Requires an approach velocity below 0.1 m/s and screen mesh sizes appropriate to target species and life stages [18].
Coanda screens are inherently fish-friendly for several reasons:
- Passive surface screening: Water passes through the slots under gravity, not suction. There is no impingement force pressing fish against the screen.
- Narrow slot widths: 0.5–1.0 mm slots physically exclude even larval-stage fish [19].
- Self-cleaning flow: Debris and organisms on the screen surface are swept to the bypass, not trapped.
- No entrainment: The slot geometry and low slot velocities prevent fish from being pulled through the screen.
A 2026 systematic review of fish guidance barriers found that physical screens are among the most effective fish protection technologies, with multimodal systems achieving approximately 80% guidance efficiency [20].
Frequently Asked Questions
What is a Coanda screen used for?
A Coanda screen is used to filter water at intake points for hydropower plants, municipal water supply systems, irrigation canals, snowmaking facilities, and wastewater pre-treatment plants. It removes debris, sediment, leaves, and aquatic organisms from the water flow without requiring external power or moving parts.
How does a Coanda screen work?
A Coanda screen works by passing water over the acceleration plate and down a curved panel of tilted wedge wire. The Coanda effect causes water to follow each wire's surface, while the wire tilt shears a thin layer of water through each slot opening. Debris larger than the slot width slides off the screen face under its own weight and the flow.
Does a Coanda screen need electricity?
No. A Coanda screen is a completely passive device that operates solely by gravity and fluid dynamics. It requires no external power, no motors, and no pumps. This makes it ideal for remote locations and off-grid sites.
What is the typical slot size of a Coanda screen?
1.0 mm is the standard slot width and is what most intakes are built with. The range offered is 0.5 to 2.0 mm (1.0 mm standard), with narrower slots on request: fish protection applications typically use 0.5–1.0 mm slots, general debris screening 1.0–1.5 mm. The slot width is selected based on the size of particles and organisms that need to be excluded.
How much water can a Coanda screen deliver?
As a generic industry baseline, a typical Coanda screen delivers approximately 140 litres per second per metre of weir width. For example, a 5-metre-wide weir can screen approximately 700 litres per second (0.7 m³/s). The real capacity depends on the available head, slot width, tilt angle, and screen length; ADENCO's own series have rated capacities of 35, 67 and 150 l/s per metre for the ADENCO-45, ADENCO-70 and ADENCO-127 respectively.
Do Coanda screens work in cold climates?
Yes, but intakes in cold climates need anti-icing measures to reduce the risk of frazil ice. ADENCO provides specialized anti-icing systems that maintain screen performance in sub-zero conditions. For a detailed guide to anti-icing methods and selection criteria, see: Anti-Icing Technology for Water Intake Screens.
What maintenance does a Coanda screen require?
Coanda screens require minimal maintenance: annual visual inspection and periodic pressure washing are typically sufficient. For the complete maintenance schedule based on more than 10 years of operating data from installed screens, see: Coanda Screen Maintenance: What 10 Years of Field Data Actually Shows.
What is the lifespan of a Coanda screen?
Constructed from AISI 304 or 316 stainless steel, Coanda screens typically provide up to 25 years of reliable service. The real service life depends on water chemistry, sediment abrasion rates, and material grade selection. Choosing the right material at the design stage is the key factor in long-term durability.
How is a Coanda screen different from a bar screen or drum screen?
A bar screen uses widely spaced bars (typically 20–100 mm) that only remove large debris and require mechanical raking. A drum screen uses a rotating cylinder with fine mesh that requires power, motors, and regular maintenance. A Coanda screen combines fine filtration (down to 0.5 mm) with passive, self-cleaning operation: no power, no moving parts, and much finer screening than a bar screen.
What is the Coanda effect?
The Coanda effect is a fluid dynamics principle first observed by Romanian engineer Henri Coanda in 1910. It describes the tendency of a fluid jet to adhere to a nearby curved or flat surface. In Coanda screens, this effect causes the water flowing across the screen face to follow the curved wire surfaces, increasing the amount of water collected through the screen slots.
References
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Coanda, H. (1934). "Procédé et dispositif pour faire dévier une veine fluide pénétrant dans un autre fluide." French Patent No. 788,140.
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Wahl, T.L. (2003). Design Guidance for Coanda-Effect Screens. U.S. Bureau of Reclamation, Research Report R-2003-03. Denver, CO.
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Wahl, T.L. (2001). "Hydraulic Performance of Coanda-Effect Screens." Journal of Hydraulic Engineering, Vol. 127, No. 6, pp. 480–488. ASCE. DOI: 10.1061/(ASCE)0733-9429(2001)127:6(480)
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Wahl, T.L., Shupe, C.C., Dzafo, H., & Dzaferovic, E. (2021). "Surface Tension Effects on Discharge Capacity of Coanda-Effect Screens." Journal of Hydraulic Engineering, Vol. 147, No. 8. ASCE. DOI: 10.1061/(ASCE)HY.1943-7900.0001902
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"Susceptibility of Type 304/304L and 316/316L Austenitic Stainless Steels to Chlorides in Cooling Water." Digital Refining. Retrieved April 2026, from https://www.digitalrefining.com/article/1002873/
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Daly, S.F. et al. (2023). "Prevention of Water Intake Blockage by Ice during Supercooling Events." Journal of Cold Regions Engineering, Vol. 37, No. 1. ASCE. DOI: 10.1061/JCRGEI.CRENG-676
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U.S. EPA. (2014). "National Pollutant Discharge Elimination System: Final Regulations to Establish Requirements for Cooling Water Intake Structures at Existing Facilities." Federal Register, 79 FR 48300.
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Published by ADENCO: Advanced Engineering Coanda Intake Screens. With offices in Istanbul and Sindelfingen, ADENCO designs, manufactures, and delivers custom Coanda intake screens for hydropower, municipal, agricultural, snowmaking, and industrial applications worldwide. Request a quote or contact our engineering team for project-specific design guidance.