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How to calculate GPM for scuppers?

November 07, 2023 3 min read

How to calculate GPM for scuppers?

Water features improve your environment in every way possible. They create a tranquil atmosphere for you and your guests to spend quality-time. The element of waterfall is proved to be beneficial for the mind, body and soul. While some people go for the traditional GFRC fountains replicating the old-word charm, others opt for contemporary fountains for gardens with modern design trends that truly enhance the look of your space with their captivating designs and melodious sounds. But not every one desires for a fountain in their backyard. Having a waterwall or water bowls near your swimming pool or is the latest trend.

A waterwall is a wall incorporated with scuppers for a soothing waterfall display. A waterwall can be incorporated in a garden, beside or around any waterbody, most commonly a pool or pond or any indoor or outdoor space. Also, Water bowls and fire & water bowls make for great pool accents creating a mesmerizing water-spill display. Both waterwall or bowls feature scuppers for the provision of water flow.


What is a Scupper?

Straight Flow Spillway Scupper

Acanthus Scupper

Bobe Radius Scupper 
Straight Flow Spillway Scupper - Majestic Fountains and More Acanthus Scupper - Majestic Fountains and More Bobe Fire & Water Radius Scupper - Majestic Fountains and More

A scupper is a small device installed in a wall or a vessel for the provision of drainage or spillage of water. Scupper are generally constructed of Metals such as Copper, Stainless Steel, Bronze and Powder coated steel. Scuppers are available in a variety of shapes, style and sizes with most of them being customizable in sizes. The diverse range in the scupper options make them incorporable in various small and large projects. Majestic fountains offer a diverse range of scuppers that will be the best choice for landscape projects or renovating a pool.

Application of Scuppers

Scuppers are incorporated in waterwalls, water bowls, Fire & water Bowls, and with fountains.

With Waterwalls


Waterwalls are water features constructed of stone or Bricks with single or multiple scuppers incorporated to create a waterfall effect. A waterwall can be built for indoor as well as outdoors. Mainly they are positioned near a water body. A lot of scuppers are designed especially for waterwalls to create a seamless outpour of water.

Decorative accents for Pools 


Scuppers are available in various styles ranging from bowl scuppers to flat spillway scuppers, and materials such as Copper, Stainless Steel or Bronze to choose from, to match the aesthetic of your poolside. Scuppers work well for pools proving to be the perfect device for facilitating the flow of water to any pool along with creating a style statement.    

Water Bowls/ Fire & water Bowls or Fountains


Water Bowls or Fire & water Bowls are the perfect features commonly used in landscape projects or with pools. These bowls feature the element of captivation waterflow that is all you need to elevate the look of your space. While most bowls are designed with space for water fall, some of the bowls come with pre-installed scupper giving them an edgy look. Some fountains such as the 4-way spill fountains feature scuppers for a contrasting look.

What is GPM and how to calculate GMP?

GPM stands for Gallons per minute. It’s a measurement that indicates water flow rate required for the uninterrupted waterflow. It is crucial to maintain the required GPM in order to ensure a smooth water fall through the scupper. An incorrect flow speed may affect the outpour display making it look shabby.

GPM Calculation

Formula: Length of the scupper (in inches) X 1.25

For Example, the GPM for a 20" long scupper will be:

20 x 1.25  = 25GPM

Here are some examples indicating the GPM for some standard sized scuppers.

Scupper Size  Calculation GPM
8" 8 x 1.25 10
12" 12 x 1.25 15
24" 24 x 1.25 30
36" 36 x 1.25 45
48" 48 x 1.25  60

GPM Calculation - Majestic Fountains and More

The GPM calculation is simple. All you need to do is measure the length of your scupper. Enjoy the waterfall display created by your scupper as now you know the water flow requirements to get the scupper to work and create magic that instantly elevates the look of your pool area or to create a  beautiful landscape.


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