Theo - please explain where the saturation or soaking of the soils stops. If the soil forming the basin is at all uniform why wouldn't the soaking process continue until the seepage finds a path of least resistance? Where does the seepage stop especially if the seepage finds or encounters loose, gravelly or sandy soils? I can see this soaking-saturation process occurring if the clay basin is overlain with some loose soils, BUT why use some loose soils in the first place to form a pond basin that is supposed to hold water? If you are gong to make a pond or bowl that holds water why put dirt in it that will soak up water? Why not line the entire bowl with as impervious soil as possible?
