Overcoming disadvantages in a conventional screw pump
With a conventional screw pump the discharge must be located above the highest flood level in the receiving water course, even when this flood level seldom occurs.
To reduce the discharge head we provided a lower discharge opening with a sliding gate. This results in a reduction in energy demands by about 15%. This gate at the invert of the discharge chute is manually closed prior to major storm events and when the water level in the Pitt River exceeds 3.5m geodetic.