RPE pond liner, when packaged in place, forms a waterproof barrier that prevents pond leakage. This reduces the cost of maintaining the pond and eliminates possible contamination of groundwater. This process is used for larger decorative landscape ponds, as well as ponds used for aquaculture activities. The process requires a piece of earthmoving equipment and is often done when the pond is dry.
At least 1 foot of clay is necessary at the bottom of a standard pond. Ponds greater than 8 feet deep may require additional clay cladding material. A rule of thumb cited by the University of Kentucky Geological Survey specifies 1 foot of clay for every 8 feet of water. This would suggest that a 12-foot-deep pond requires 18 inches of compact clay at the bottom of the pond.
The slopes of the lagoon are under less water pressure and require less clay. Langston University College of Agriculture says that at least 6 inches of clay on the sides of the puddle is sufficient under most conditions to stop leaks. Clay is prone to cracking if it dries. This can occur at the upper edges of the slope if the water level drops. Everything is possible to keep the ponds near full at all times.