GreenScreens
GreenScreens are low velocity, high surface area water pump intake screens for creeks, rivers, ponds and lakes.
GreenScreens
GreenScreens are low velocity, high surface area water pump intake screens for creeks, rivers, ponds and lakes.
Fish Friendly
Our GreenScreens comply with state and federal fish‑screening regulations required for water intake systems in designated waterways across the United States. They are engineered to protect juvenile fish as they pass by while still maintaining the pump’s intended flow rate.
Cleaner Water for your Pump
Lower water velocities at the screen face reduce the amount of debris—such as grasses, sand, and silt—entering your system, helping prevent clogs in nozzle tips and sprinkler heads.
What is wrong with the typical pump intake screen?
Typical pump‑mounted intake screens (like the one shown to the right) offer very limited screen area, which forces water to enter at high velocities. These velocities often exceed state and federal fish‑screening requirements for certain waterways. In practical terms, when a juvenile salmon approaches a standard screen, it cannot swim fast enough to escape the suction forces.
Zinvent’s GreenScreens solve this problem by dramatically increasing the available screen surface area. The result is a much lower water velocity at the screen face—slow enough for small fish to swim away safely, yet without reducing the pump’s overall flow rate.
On average, achieving fish‑safe water velocities requires roughly ten times more screen area than what a typical intake screen provides. This expanded area also reduces suction forces that would otherwise pull in debris or juvenile fish.
The typical pump screen is prone to debris blockage as it usually rests directly on the streambed.