Grit Movement in Water

Grit doesn’t flow like water. So what does that mean?

Controlling Velocity is the Key
The key to effective grit removal is understanding how grit moves in water. Moving grit starts with effective hydraulic designs to control velocity. With proper hydraulics and velocity control, grit can be efficiently moved and removed from the wastewater stream.How Does Grit Move in Water?
Grit doesn’t flow like water. In a wastewater channel, grit is moved by the water’s velocity currents. Velocities within the channel will move grit to the lowest velocity areas. Ideal velocities to move and remove grit range between 1.6 – 3.5 ft./sec. (0.5 – 1.1 m / sec.). When velocities dip below 1.6 ft./sec., deposition occurs.Multiple straight currents exist within a wastewater channel, each with varying velocities. Grit will generally be moved from higher velocity areas to lower velocity areas.