Land slope or lift of the land:
When purchasing a solar pump, there is much to consider, like the lift or slope of the land. But the roughness, shape, and texture of the land will also determine the movement of water. This will include the move from the ground and through the pipe to the surface. Slope of land will affect the velocity of water flow.
A high land gradient will give a higher flow, and a low gradient will slow the speed down of the water flow. A good example is a river mountain water supply. River water would flow fast and slow down substantially when the surface levels. Slope of water determines the effect of water flow.
The bigger the slope, the tougher it is for the pump to lift water. The more energy required for lifting water will determine the type of pump you will need. Head heights will play a role in solar pump choices.