TJ, thanks for that additional info based upon your experience!
I only wanted the capability to run some "dry out" periods to break any parasite cycles that may develop in an intensively managed forage pond.
[Good Bill Cody link on that below.]
Forage Pond ParasitesIF my cells were subject to cracking, I was going to leave a little water in the bottom. Even if I dried the ponds completely over winter, we still get some winter rains and snows that should keep enough moisture in the clay to avoid cracking.
Further, I think it would have to be a pretty tough parasite to survive a hard-freeze of any puddle of water at the bottom of the pond, plus several inches of frozen pond-bottom soil.
I think the best advice is just to get 'em built and get going on some good water for the forage fish!