Build DIY pond waterfall itself can be a rewarding experience, but dealing with water can be tricky so you have to arm yourself with as much information as possible to build something that you will be happy with.
For every inch of width DIY pond waterfall, you must have at least 100 to 150 GPH of water supplied by your pump. Example waterfall: if you want to bowl at the top of your waterfall to have 10-inch wide areas where the water rolled over and down the waterfall, you will need a pump that can provide 1000gph. Additionally you need to understand how the pump is rated to ensure that you get the desired effect you are looking for.
The maximum class for your pump, said 1000gph, referring to the pump with zero head pressure. Head pressure refers to the weight of the water pump lift and push. If the pump must lift the water far it will generate less GPH. Simple, the pump will have a rating that refers to the amount of vertical ascent of water will need to make. It will supply the graphics in the pump specification stating zero head pressure GPH, but also GPH to expect with the vertical lift one foot, or two feet of vertical lift, or five feet of vertical lift and so on. That article about DIY pond waterfall which we can pass.