How To Calculate Waterfall Pump Flow Rates

Waterfalls and watercourses look great and bring the tranquil sound of running water into your garden. However, the amount of water flow can be difficult to calculate, so David Coton explains how to work out exactly what's required.

Created by David Coton on Tuesday, 14th of May, 2013.
Updated on Monday, 30th of April, 2018.


Waterfall at Hall's Garden Supplies, Sutton Coldfield

There are some very good reasons for adding a waterfall to your pond. Water, when breaking the surface of a pond adds vital oxygen, this is not only beneficial for ponds containing fish or other aquatic life but it has also been found to be very good at promoting friendly bacteria levels. This bacteria then breaks down sludge and silt which sits at the bottom of your pond and can pollute the water over time. 

How Much Water Flow Do I Need?

The trickiest part for most people is how much water flow is required. It’s actually very simple to calculate as I will explain.

First you need to measure the head height or head measurement, this is the height of the waterfall from the surface of the water, and then next measure the width of the waterfall.

If you want to achieve the type of effect that you see in most people's gardens, then the easiest way to calculate the flow is to measure the width in cm and multiply that number by 1.5, this will then give you the required flow rate in litres per minute (multiplying this amount by 60 will give you litres per hour).  

It's important to have the correct flow rate as too little will just give you an unimpressive slow trickle of water, while too much will create an inappropriate torrent.

Waterfall Calculation Example

Here is an example of how to work out the flow required in litres per hour:

If your waterfall is 65cm wide: 65 x 1.5 = 97.5 litres per minute x 60 = 5850 litres per hour flow required.

If you wanted something slightly stronger then just double that number, but then we would advise higher walls to your waterfall to prevent water loss.

Of course, if you plan to have a tallish waterfall you will still require the same litres per hour but may need a larger pump that can achieve that height at the required rate. This is because as you increase the pumping height the output of the pump in litres per hour decreases.

Type of Pump

When possible, always use a solids handling pump as these can pump through a much larger pipe giving you less loss of pressure and a more consistent waterfall. Try to limit the joints and fittings you use as this can also cause a loss of flow.

If you are planning to have a massive waterfall or something with a very big drop it is advisable to speak with a pond specialist as they will be able to calculate an exact specification for you.

There will always be someone to answer queries regarding water flow on our 0121 355 7701 helpline or visit our aquatics superstore in Birmingham. 

 

Related Articles

Our Guide To Outdoor Water Features

Our Guide To Outdoor Water Features

There's little doubt that the sight and sound of flowing water brings another dimension to a garden. Self-contained water features can be stunning focal points or discreet ornamentation. They add animation to a garden, kindling visual and aural interest in areas that have previously lacked a spark.

Author: David Coton

Written by David Coton.
Published on Monday, 8th of April, 2019.

How Can I Prevent A Pond From Freezing?

How Can I Prevent A Pond From Freezing?

An iced over pond will have a detrimental effect on animal and plant pond life, although fish and amphibians will survive under a frozen surface for some time, ice traps gases escaping from decaying material and prevents oxygen from entering the water.

Author: Dan Everton

Written by Dan Everton.
Published on Wednesday, 22nd of August, 2018.

What To Do In The Garden In May

What To Do In The Garden In May

With the recent hot weather encouraging everyone out into the garden and the threat of frost disappearing during May, David Coton is in no doubt that this is going to be a busy month.

Author: David Coton

Written by David Coton.
Published on Monday, 30th of April, 2018.

What To Do In The Garden In April

What To Do In The Garden In April

With warmer weather and Easter coming along soon, the garden centre is getting increasingly busy with customers stocking up on bedding plants to fill planters, borders and hanging baskets with colour that will last all summer. There are always plenty of jobs to do in the garden during April and David Coton has these suggestions.

Author: David Coton

Written by David Coton.
Published on Thursday, 29th of March, 2018.

comments powered by Disqus

Author

David Coton

Partner at GardenSite

View Profile

RSS

View RSS Feed

Follow Us!

Recent Articles

Review of the Juliana Urban City Greenhouse

Review of the Juliana Urban City Greenhouse

Robert Hall highlights the pros and cons to Juliana's new urban greenhouse range, reviewing the City, Balcony and Vertical greenhouse models after his first look at these fabulous new additions.

Author: Robert Hall

Written by Robert Hall.
Published on Thursday, 9th of May, 2019.

What To Do In The Garden In May

What To Do In The Garden In May

With the recent hot weather encouraging everyone out into the garden and the threat of frost disappearing during May, David Coton is in no doubt that this is going to be a busy month.

Author: David Coton

Written by David Coton.
Published on Monday, 30th of April, 2018.

Review of the new Elite Edge Greenhouse

Review of the new Elite Edge Greenhouse

Elite Greenhouses have always been at the forefront of new design combined with an unrivalled user-friendly experience and the Edge has got it all.

Author: David Coton

Written by David Coton.
Published on Friday, 5th of April, 2019.

Planned TV Gardening Programmes 2019

Planned TV Gardening Programmes 2019

There's no doubt that television provides gardeners with inspiration, sound advice and good ideas, that's why we're all looking forward to new programmes and the return of old favourites during 2019.

Author: David Coton

Written by David Coton.
Published on Tuesday, 13th of February, 2018.