How to Measure Flow Rate For waterfall Pumps

You need a pond and waterfall pump that gives you the desired flow to suit your needs. In simple terms the amount of water you would like to see flowing over a waterfall is dependent upon the width of the overflow lip or edge. If you have a wide waterfall lip then obviously you would need a larger amount of water from the pump to flow over the edge. If the water flow was a trickle then there would be little point in having such a wide overflow. The rule of thumb is 250 gallons per hour of water per inch of overflow edge. Here's how you find out how much water you need to pump using another method..

If you would like to test how much water looks best for your waterfall do the following .....

Place a hosepipe into the waterfall inlet

Adjust the flow until you are happy with the effect

Without closing the hose fill a known volume container from the hose pipe

Calculate the flow rate by dividing the volume of the container by the time taken to fill it. This week's free calculator could come in useful here.

This calculator would also allow you to weigh the container as an alternative to knowing its volume. For water use the following:

1 US gallon weighs 8.83 lbs

1 Imperial gallon weighs 10 lbs

1 litre weighs 2.2 lbs

If one hose does not deliver sufficient water then use 2 hose pipes.

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