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Flow graph Flow graph, what does it mean, what use is it? A pump flow graph is used to determine how much water a pump can pump and to what height.
Using the graph above as an example: (each small line is 4 gallons) If the pump outlet is 1 foot from the water surface you will get 96 gallons per hour If the pump outlet is 2 feet from the water surface you get 76 gallons per hour If the pump outlet is 3 feet from the water surface you get 48 gallons per hour If the pump outlet is 4 feet from the water surface you get 0 gallons per hour
So you can see the higher the water outlet is from the water surface the less water will flow. Most pumps will have a flow graph on the box, make sure the pump you choose is suitable.
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