OK am I doing this right?
From the USDA Ponds, Planning Design & Construction.
It shows (Figure 11) I am on the line between 8 to 12 drainage acres required for each acre-foot of storage. So for fun lets say 10.
So 28 acres / 10 = 2.8 acre-foot
I will need 12 feet at least if I want to keep anything alive over winter and from "Pond Capacity" it says to use max depth X .4 X the surface area.
so 2.8 / (12 X.4) = 0.58 acres max surface area?
What I have right now...

And I can not just dig deeper legally.
Am I missing something? Hope so.