Cook Coanda Screens
Coanda Screens use a combination of overflowing water and gravity to stay clean. For remote sites, the combination of low maintenance, intrinsic sediment transfer, and high capacity help lower the total installed cost of a facility.
A Coanda Screen does not require mechanical cleaners or a bypass for debris. Clean water falls through, fish and debris pass over.
Cook Coanda Screens use all stainless steel construction, and high quality wedge wire from Norris Screen on all of our systems.
Our systems are designed by a team with decades of experience in mechanical engineering, flow and sediment analysis, and installing hundreds of Coanda Screens. This experience gives insight for applying the technology to your site. The screens are built in our fully functional, ISO 9001 compliant factory in Columbus, Ohio.
Ruaha Energy, a small power producer
in Tanzania, is using Coanda screens
as part of a MOD-Hydro System.
The screens allow for safe passage
of fish and sediment and simplify the
intake with a modular design allowing
for fast, accurate installation.
Theory of Operation
Water flows over an accelerator plate and then onto the screen. This presents a fast, smooth nappe of water. The bottom layer of water is then sliced through into the diversion while the overflowing water moves sediment and sweeps away debris.
The Coanda Effect
The way that a fluid jet follows a
surface in water. This effect enhances
the efficiency and performance of a
The way that a fluid jet follows a surface in water. This effect enhances the efficiency and performance of a Coanda screen.