Augie,
If the actual facts on the ground don't match the engineering, then the engineering is wrong! (Or at least one of the assumptions used in your engineering calculations was wrong.)
What is your typical water temp in late July or early August? What is your elevation? What is your surface acreage?
Instead of a flat "no way", let's at least try to send the guy some useful information. Your personal pond experience is probably some of the best data that ewest could forward.
