How to Build a Pond

Today the most popular way to build a pond is to use either a pre-formed shape or a liner, concrete is more time consuming and can be very demanding, Dan Everton compares the merits of each method.

Created by Dan Everton on Wednesday, 11th of May, 2016.
Updated on Tuesday, 20th of December, 2016.


Pond Construction

With the advent of modern plastics, liner and pre-formed ponds have overtaken concrete as the preferred method for constructing ponds, each has its own merits and this comparison will enable you to make up your own mind.

Liner

Have a plan in mind of what you want to achieve and outline the desired shape with rope or sand. Then you can start digging.

Create shelves at different depths to accommodate various types of aquatic plants, perhaps very shallow at 2ins, then 5 inches and wide enough to hold containers, and 18 inches.  Overall depth should be at least 2 ft and 4 ft if you want to keep fish.

It might sound obvious but make sure that the liner you purchase is the correct size for the pond you are building. Measure the length, width and depth of the pond. Then, double the depth and add the length and width. Now add 2 feet for overlapping the pond edge. This will give you the correct size.

The hole must be level so use a spirit level balanced on a block of wood to check all around the sides. Remove any sharp stones or tree roots that may pierce the liner.

Now line the hole with a layer of sand or other material such as old carpet. If possible warm the liner in sunlight to make it more flexible and shape it into the hole, try to keep wrinkles to a minimum and add a little water to help settle it into place.     

Slowly fill with water making sure the liner doesn’t stretch. Trim off any excess liner above the water line and use mortar to fix patio stones or similar around the pond edge to keep the liner in place.

Pre-formed

Place the pond (the correct side up, not upside down) where it is to be positioned and mark out by drawing around the shape in sand. Next measure the shelves. Then dig out the shape including the shelves but adding about 5cm to the depth to allow for a lining of sand.

Remove any stones or roots as they might pierce the liner. Then place the liner into the hole and adjust the shape if necessary, making sure it is level (use a spirit level balanced on a piece of wood across the width and length of the pond). Once you are satisfied the shape is correct, line the hole with the sand and return the pond and it should fit snugly.

When you are sure the pond is level, use sand to back fill and compact it to prevent the pond from moving as it is filled with water.
However carefully installed there’s always a chance of some movement, so once filled, leave the pond for at least one week before adding edging stones, plants or other features.

Concrete

First the hole needs to be dug, about 6 inches below what will be the final depth, making sure that the levels, angles and sides are accurately measured - a formal pond needs to look exactly true.

Then dig a trench, about 4 inches deep by 8 inches across, around the sides at the base of the hole and fill this trench with concrete to provide foundations for the walls.   

With the bottom of the hole level, add a layer of sand, compact it firmly adjacent to the wall foundations, and lay 3 inches of concrete. Allow to dry, then add some galvanised mesh and pour another 3 inches of concrete on top.

Once the cement has dried use breeze blocks to form the walls, filing in any gaps and hollows with concrete.

After 48 hours, dampen the walls and skim the entire hole with a ½ inch layer of fibre reinforced cement. Next, use mortar to fix an edging of bricks and slabs, allowing for a 2 or 3 inch overhang. Paint the inside with a good quality waterproof sealant, when that is dry you can introduce water.  

Finally, bear in mind that for all types of pond, filters, lights and other features will need electrical and hose connections, so remember to allow space for these while adding any edging materials.

For information on how to introduce plants into your pond, read our blog 'How To Transform Your Pond With Plants'.

Follow these links to our range of pond liners and pre-formed ponds.

Related Articles

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.

Reasons To Choose An Intalogs or Blagdon Raised Pond

Reasons To Choose An Intalogs or Blagdon Raised Pond

There's no doubt that building a pre-formed or liner pond involves a certain amount of hard work, so Nathan James Dodd thinks that a raised version from Intalogs or a Blagdon is well worth considering.

Author: Nathan James Dodd

Written by Nathan James Dodd.
Published on Thursday, 12th of May, 2016.

How To Transform Your Pond With Plants

How To Transform Your Pond With Plants

A pond is an essential part of the garden landscape, and plants transform their appearance as well as ensuring a healthy aquatic environment. Dan Everton, our Aquatics Supervisor, shares his thoughts on the best plants to use.

Author: Dan Everton

Written by Dan Everton.
Published on Wednesday, 11th of May, 2016.

GardenSite Visits Oase Living Water In Germany

GardenSite Visits Oase Living Water In Germany

Oase is a company that is passionate about water, with a huge range of products that will soon include a brand new indoor aquarium range. That's why I recently went over to Germany with my colleague Andrew Hall to visit their headquarters.

Author: David Coton

Written by David Coton.
Published on Tuesday, 16th of February, 2016.

comments powered by Disqus

RSS

View RSS Feed

Author

Dan Everton

Aquatics Supervisor & videographer

View Profile

Follow Us!

Recent Articles

Grange Launch Their New Products For 2018

Grange Launch Their New Products For 2018

David Coton was recently invited to the exclusive launch of Grange's new products for 2018, the result of significant investment that the garden structures and fencing firm have received from their Polish parent company.

Author: David Coton

Written by David Coton.
Published on Monday, 30th of October, 2017.

What To Do In The Garden In November

What To Do In The Garden In November

David Coton suggests that there are plenty of gardening jobs that need to be done in November, from why you shouldn't throw away your fallen leaves to how to take care of your vegetable patch.

Author: David Coton

Written by David Coton.
Published on Friday, 27th of October, 2017.

What To Do In The Garden In October

What To Do In The Garden In October

In October, David Coton is getting the garden prepared for the onset of colder weather but, at the same time, the arrival of spring bulbs in the garden centre is a reminder that you should also now be planning ahead for next year.

Author: David Coton

Written by David Coton.
Published on Monday, 2nd of October, 2017.

VegTrug - The Easy Way To Grow Your Own Vegetables

VegTrug - The Easy Way To Grow Your Own Vegetables

At GLEE this year David Coton visited the VegTrug stand to find out how their specially designed space saving planters can encourage us to grow more of our own food without the use of pesticides.

Author: David Coton

Written by David Coton.
Published on Thursday, 14th of September, 2017.