Building your own backyard waterfall without the help of backyard waterfall contractor can be a rewarding experience anyway dealing with water can be tricky so you must arm yourself with as much detail as possible in order to build something that you will be happy with.
Minimum flow rates
For every inch of width of your backyard waterfall, you should have a lowest of 100 to 150 gph of water supplied by your pump. Waterfall example: if you want the peak bowl in your waterfall to have a ten-inch broad area where the water rolls over and down your waterfall, you would need a pump that can deliver 1000gph. Further, you need to understand how pumps are rated to make sure that you get the wanted effect that you are looking for. There is an efficiency loss in the action of water via pies and you will need an account for this to ensure that your waterfall gets the water flow it requires.
Fittings cause head loss
Another thing in this equation is fittings such as 90-degree elbows, 45-degree elbows and bends in the pipe or valves also will raise the head force. A pump that has to lift the water 1 foot, but also through a series of 4 or 5 ninety degree elbow fittings will have significantly less gph than a pump pushing via a straight run of pipe.
Pump ratings and head loss
The highest rating for your pump says 1000gph, favors to a pump with zero head force. Head force favors to the weight of the water that the pump is pushing and lifting. If the pump has to lift the water a long way it will generate less gph.
For this reason, you need to determine how to stop your pump will need to push the water to get your peak bowl and also how wide you want the spillway in your peak bowl to be. This will provide you an idea of what size pump you want. Assuming the same ten-inch wide spillway and a vertical climb of 5 feet to get the peak bowl, you would need to find a pump that can generate a minimum of 1000gph with a head of five feet. This means that the label on the pump would likely be approximately 1250 gph referring to the zero head force rating for the pump with a performance of approximately 1000gph with 5 feet of head. If you need more help hire a masonry contractor to do this job. LaGrass