Also how do you dig a pond 15'+ in some parts with water table being 5,10, or 12' down.
There are ways. A few are:
-- lots of pumping
-- Use a dragline
-- sit just above water level and dig. Say go down 5', then have an excavator that digs down 10'.
All will probably add to the cost and possibilities of what you would like versus what you get become limited.
