"Start by choosing a location to outline the pond shape and then dig a hole that fits the shape and depth of the liner," suggests Petar Ivanov, garden and plant expert at Fantastic Gardeners.

First, a deep pond can be classified as a pool and may be subject to pool regulations ... By far the cheapest way to install a pond is with a liner like this. All you need to do dig a hole ...

Start filling the pool with water and pull the edges of the liner so that it fits neatly over the contours of the pond. Continue filling the hole with water until the pond is full. Trim the sides ...

If the water level in a lined pond drops or the flow of water decreases, check that no part of the liner has slipped below the water level. If a pond is leaking, it needs to be drained and inspected.