The turbine of our high flow pump has been designed to enhance its water flow at the expense of its pressure. Its flow performance to level is simply outstanding, making it ideal for surface irrigation, emptying pools, or any other type of transfer without significant slopes.
Usually from 15-20 meters of slope the ratio flow/ height begins to lose efficiency so it would be more advisable to use a pressure pump.
Choosing a water pump (PDF) by SG Group
Axial flow pump by Wikipedia