Securing the Liner
It is essential that the liner is securely fixed to prevent it losing its shape or slipping into the lagoon. The simplest method for lagoons is to bury the edges of the liner in an anchor trench surrounding the lagoon. The position and dimensions of the trench are dependent on the size of lagoon, and the stresses on the liner. Typically, the trench should be set back at least 500mm from the edge and it should be approximately 300mm x 300mm; as shown in the below image.
Anchor Trench System