Calculating 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 Andy Hobson explains how to work out exactly what's required.

Created by David Coton on Tuesday, 14th of May, 2013.
Updated on Thursday, 12th 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, 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?

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 April

What To Do In The Garden In April

With warmer weather and an early Easter, the garden centre is busy at the moment with customers stocking up on summer bedding plants - snapdragons, cornflowers, cosmos, verbena, phlox, petunia, As well as filling planters, hanging baskets and borders 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 spell of hot weather, David Coton was glad to see the recent rain freshening up the Garden Centre and he has these suggestions for some of the jobs that need to be done during August.

Author: David Coton

Written by David Coton.
Published on Thursday, 27th of July, 2017.

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.

Tetra Survey Proves Pets Are Good For Children

Tetra Survey Proves Pets Are Good For Children

Tetra have been innovators in the world of aquatics for over 60 years, and Ellie Goodall has been reading a research survey they have recently published proving that keeping a pet is good for your children.

Author: Andrew Taylor

Written by Andrew Taylor.
Published on Monday, 27th of June, 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 April

What To Do In The Garden In April

With warmer weather and an early Easter, the garden centre is busy at the moment with customers stocking up on summer bedding plants - snapdragons, cornflowers, cosmos, verbena, phlox, petunia, As well as filling planters, hanging baskets and borders 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.

How Can I Help To Save Our Bees?

How Can I Help To Save Our Bees?

Every gardener must have noticed a decline in the bee population over recent years. Intensive farming that demands the use of toxic chemicals, climate change and parasite infestation have all been put forward as potential causes, it's a worrying trend but one that we can all help to reverse.

Author: Martyn Loach

Written by Martyn Loach.
Published on Thursday, 22nd of March, 2018.

Trimetals Launch Two New Guardian Sheds

Trimetals Launch Two New Guardian Sheds

As an excellent alternative to conventional products, Trimetals' storage solutions blend top quality manufacture with contemporary style. Their range has now been extended to include two new maintenance free sheds and Robert Hall has all the details.

Author: Robert Hall

Written by Robert Hall.
Published on Monday, 12th of March, 2018.

GardenSite Visit Zest 4 Leisure Direct New Distribution Centre

GardenSite Visit Zest 4 Leisure Direct New Distribution Centre

Zest 4 Leisure manufactures a large variety of timber garden furniture, fencing and leisure products, David Coton visited their brand new nine acre site near Chester last week to find out more about current development and future plans.

Author: David Coton

Written by David Coton.
Published on Friday, 9th of March, 2018.