I had an approximately 7 acre lake built on rural property in central Texas - 800 foot dam, excavated 25,000 cubic yards for 8 foot minimum water depth at back to avoid lilly pads. All went fine until a slow leak was confirmed last summer where I lost all but 1/4 surface acre and virtually all my fish.

I'm drilling a water well now but am not sure I want to pump forever to keep full and have read there are means of applying bentonite to bottom without draining the entire lake (now almost full again due to rains).

I've also heard sprinkling bentonite on the surface is not effective. Does anyone know of a means to fix not requiring drainage and applying a clay liner?