Apply Foam Sealant

What happens here

After the boulders are meticulously placed and the spillway is secured, apply a foam sealant, specifically black waterfall foam, to fill any existing gaps between the rocks and the pond liner. This serves a critical dual purpose: it firmly anchors the rocks in position, preventing any unwanted shifting over time, and, more importantly, it effectively directs the water flow over the intended paths and cascades, preventing it from seeping behind the waterfall structure. By creating a 'weeping area' or a natural French drain effect, any water that inadvertently travels outside the main flow is guided back into the reservoir system, thereby eliminating potential leaks.

Goal: Seal gaps between rocks and liner to prevent leaks and direct water flow