I'll be going the "Mini Specific" pond rout also. Largest one will be 30' x 80' x 8' deep. EPDM liners will be required.
It was a bummer to find out the water table receded to about 17' after many years of "don't poke a stick in the ground or it might just squirt you in the eye". I have an idea of what caused the change.
Plans for the front pond of about 1.5 acres are not looking realistic at all
