Koi

Liner ponds are often regarded as the simplest form of pond construction and offer the potential of quickly lining ponds of almost any size and shape. Butyl rubber is traditionally recognised as the toughest and most flexible form of pond liner – they can be made from a range of materials and come with a long guarantee. While pond liners are quick and easy to install, they do require some experience to prevent unsightly creases, and they are also more likely to be damaged and holed compared to other types of pond.

Installation of a liner pond often benefits from the construction of a concrete collar in the shape of the pond before any excavation takes place. The collar will help to stabilise the soil, provide a stable foundation for capping stones and ensure that the edge of the pond remains perfectly level. Once excavated, line the pond with a protective pre-liner before adding the pond liner on top, then slowly fill the pond and gradually pull out any creases.

The internal dimensions of the excavated pond dictate the size of liner. The length of liner required is equivalent to the maximum length of the pond plus twice the maximum depth, plus an overlap of approximately 50cm. The overlap helps to hold the liner in place by trapping it between the concrete ring and the capping stone.

The installation of side drains or bottom drains required for gravity-fed filters is surprisingly simple. Drains intended for liner ponds contain a collar that locks them in place and while they are simple to fit, the process of cutting a hole in the liner to fit the drain is always a hair-raising moment!
 

Written by Craig Baldwin