Enter the width (ft) into the Calculator. The calculator will evaluate the Waterfall Pump Size. 

Waterfall Pump Size Formula

WPS = W * 30


  • WPS is the Waterfall Pump Size (GPM)
  • W is the width (ft)

To calculate Waterfall Pump Size, multiply the width in feet by 30.

How to Calculate Waterfall Pump Size?

The following steps outline how to calculate the Waterfall Pump Size.

  1. First, determine the width (ft). 
  2. Next, gather the formula from above = WPS = W * 30.
  3. Finally, calculate the Waterfall Pump Size.
  4. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

width (ft) = 3

Frequently Asked Questions

What factors should be considered when selecting a waterfall pump?

In addition to the width of the waterfall, factors such as the height of the waterfall, the length of the tubing from the pump to the top of the waterfall, and the desired flow rate should be considered to ensure the pump can effectively circulate water through the waterfall system.

How does the height of the waterfall impact the pump size needed?

The height of the waterfall affects the head pressure that the pump must overcome to circulate water to the top of the waterfall. The higher the waterfall, the more powerful the pump needs to be to ensure an adequate flow rate at the top.

Can the formula provided be used for any type of waterfall?

The formula is a general guideline for typical garden or backyard waterfalls. For more complex or large-scale waterfall installations, additional factors such as water volume, resistance due to pipe length and bends, and specific aesthetic desires may require a more detailed calculation.

Is it better to overestimate or underestimate the pump size when calculating the waterfall pump size?

It is generally better to slightly overestimate the pump size to ensure adequate water flow and to compensate for any calculation inaccuracies or future modifications to the waterfall. However, significantly oversized pumps can be more expensive to purchase and operate, so finding a balance is important.