Pond Liners

Assisted Natural Pond Liners

Should you line a new pond or re-line an old pond that is leaking? These are among the most commonly asked and financially significant questions about large ponds and lakes.

lining a pondIn between the above two options are 'assisted' ponds which hold water because imported clay materials or naturally occurring soils have been improved by mechanical puddling.

Dew ponds are an example of this, often using imported clay to form a pond on top of chalk downland.

Sometimes there is just enough naturally occurring clay in the soil that it can be made to hold water by mechanical 'puddling' or working of the clay. An alternative approach uses bentonite powder, either just incorporated with the naturally occurring soils or held in combination with a fibre mat laid as a lining to the pond, and this will reseal itself if punctured by a tree root, a horse's hoof or anything else.

Artificial Pond Liners

At the other end of the spectrum are ponds that rely on a completely man-mad lining such as a PVC pond liner. With such technology it is possible to build a pond literally anywhere - even on top of several hundred feet of highly porous chalk - but in such circumstances it is absolutely critical to ensure the integrity of the liner.

The choice of waterproof material and of any protective matting is crucial and so too is ground preparation and the removal of any roots, sharp stones or other items that could cause punctures. Although pond liner repairs can be made, finding the leak in a large lake can be nigh impossible. One important consideration is to cover the liner with enough back fill to prevent damage, but the soils for this purpose must be chosen with care.

Large pond liners can be very costly, while a cheap pond liner may be a false economy if it becomes punctured and starts to leak. Make sure that you make the right decisions and choices.

Naturally Holding Ponds

naturally holding pondsSome ponds will hold water naturally because they have formed or been dug in impervious clay soils. These are among the easiest ponds to create and maintain but few of us have such soils and still more rarely in exactly the right place. If you are one of the lucky few, you really can just dig a hole and let it fill.
On the other hand, such ponds can be difficult to plant up because clay soils tend to be poor in nutrients. Specialist advice may be necessary.

For specialist independent advice on pond liners,
call Hampshire Land & Water the pond consultant on 00(44) 1722 710848

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