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

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.

What To Do In The Garden In August

What To Do In The Garden In August

After the recent record breaking spell of hot weather, David Coton was glad to see recent rain freshening up the Garden Centre, but the sweltering heat is set to continue and he has these suggestions for some of the jobs that need to be done in the garden during August.

Author: David Coton

Written by David Coton.
Published on Friday, 27th of July, 2018.

Bermuda Aquatics Brand Back In Business

Bermuda Aquatics Brand Back In Business

The Bermuda brand is back! That's the great news GardenSite partner Andrew Hall has received from Bob Meacham, National Accounts Manager for the new owners Evolution Aqua.

Author: Martyn Loach

Written by Martyn Loach.
Published on Wednesday, 14th of December, 2016.

comments powered by Disqus

Author

David Coton

Partner at GardenSite

View Profile

RSS

View RSS Feed

Follow Us!

Recent Articles

What To Do In The Garden in June

What To Do In The Garden in June

At this time of the year you'll find a fabulous selection of summer bedding at our Garden Centre in Birmingham. David Coton will be planting the bedding in containers this month to achieve a wonderful display of colour and here are some other jobs to do in the garden in June.

Author: David Coton

Written by David Coton.
Published on Sunday, 27th of May, 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.

Review of Biohort Highline

Review of Biohort Highline

Sometimes only the best will do. And if you are looking for the best domestic shed on the UK market it will probably be branded with the Biohort name and logo.

Author: Robert Hall

Written by Robert Hall.
Published on Wednesday, 17th of April, 2019.