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Germany, Austria, Switzerland


Submerged Water Intakes JOIS™

Reliable Technologies powered by our brands Geiger® & JOIS™

The Johnson Screens® high capacity passive intake screens are constructed using non-plugging VeeWire® with a patented internal flow modifier that creates a nearly uniform low velocity flow through the entire screen surface. This significantly reduces impingement and entrainment of debris while protecting aquatic life.

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Passive screens are typically designed to meet regulatory requirements for a maximum slot velocity of 0.15 m/s (0.5 ft./s) which is the maximum velocity at which a juvenile fish can turn around or,  swim away without being impinged onto a passive screen. This, combined with a typical slot width range of 2 to 10 mm (0.04 to 0.4 in.) will determine the screen sizing. The large open area and low velocities result in a highly efficient and compact water intake screen.

Key Features

  • Low capital costs and no moving parts, and low maintenance needs
  • Environmentally-friendly – this approach meets the EPA’s 316b regulations for fish protection
  • No waste stream – there is no debris brought to the surface to be handled or disposed of
  • Easy cleaning – with a periodic blast of compressed air using our Hydroburst™ system
  • Non-plugging Vee-Wire®
  • Three standard configurations – drum, tee and half screens
  • Selection of materials available from 304 and 316L stainless steel for fresh water to Duplex and Super Duplex for seawater applications and Z-alloy (CuNi) for repelling zebra mussel attachment and anti-bio fouling
  • Dual-flow modifier – provides low and even slot velocity (CFD modelling is available on demand)