AquaShear™ –  Advanced Coanda Intake Screens for Hydro

Dulas are the pioneers behind the ground-breaking AquaShear Coanda screen, which offers a low-cost operation and a unique solution that prevents clogging, maximises flow potential, and reduces the need for regular maintenance inspections.

Dulas provide technical expertise for large or high value installations that utilise AquaShear screens, and we are proud to say that these projects consistently deliver on their potential.

We offer ten AquaShear screen models. These vary in height and bespoke features. The type of screen used on any given project will depend on the head and width available on the intake site, as well as on the required flow rate. Dulas can advise on which screen would prove most suitable for your site.

How the screens work

The screen is mounted on the downstream face of an intake weir. Water passes on to the screen via a specially designed acceleration plate, which provides an even distribution of flow and an increase in the water velocity.

As the water moves down the steep face of the screen at high velocity, excluded silt and debris is flushed away to continue downriver. The abstracted water passes through the screen and collects below in a chamber connected to the pipeline or intake channel.

The screen’s design means that only clean water can enter the intake system, while debris such as leaves, twigs and even fish eggs are excluded. The excluded debris remains in the river, eliminating any need to dispose of waste material.

How the screens are made

AquaShear Coanda screens are made from stainless steel. They consist of precisely positioned, finely spaced horizontal wedge wires built into a carefully designed screen.

The high capacity of the screen is achieved through a combination of two things: the Coanda effect (the tendency of fluid to cling to a surface) and the shear produced by the hydraulically sharp edges of the wedge wire.