Heavy rains can alter water levels and create pressure changes that may lead to stress on a pond liner, especially if the liner is not adequately secured. An overflowing pond can dislodge anchoring stones and soil, displacing the liner and potentially tearing it. If the surrounding soil becomes saturated, it may shift or erode, removing the liner's structural support and causing it to sag.
A dislodged or sagging liner is likely to develop leaks or other damage. To prevent this situation, it's important to ensure proper installation of the liner, including a robust anchoring system. An underlayment can provide additional protection against the effects of erosion. If heavy rains are common in your area, consider installing an emergency overflow system that can guide water out of the pond into an appropriate drainage system. After heavy rain events, it's important to inspect your pond and liner for damage or movement which could compromise its integrity.
