Careful installation and strategic planning can go a long way toward protecting your pond liner. Start by preparing the ground for a completely smooth base that's free of sharp objects and protrusions. Add a layer of sand that's 3 or 4 inches deep for extra protection. Using underlayment, such as a nonwoven geotextile fabric, can provide an extra layer of protection against punctures from rocks, roots, or debris that can work its way up through the soil.
To deter large animals, such as deer, raccoons, or loose pets, you might install fencing or create natural barriers around the pond with boulders or large, smooth stones to minimize access. Planting dense vegetation along the edges can also act as an attractive deterrent. Netting can discourage birds from landing in the pond, puncturing the liner with claws and beaks, and snacking on your fish! If you have burrowing animals like moles or groundhogs, you may need to take additional measures to prevent them from tunneling under the liner. This could include burying wire mesh beneath the liner or installing underground barriers around the pond perimeter.
