This pondxpert 15m x 10m 49' x 33' pond liner is a popular choice with pondkeepers who are looking to create a large water gardening installation. A liner this size can be used to create a pond sized lxwxd 12m x 7m x 1m 39' x 23' x 3'3. Of course your choice of pond design is limitless just remember that if you go deeper then you need to reduce the length and width. Once built a pond to the dimensions shown above could hold 15,000 litres of water 18,500 gallons.