I got a field like that, on a smaller scale, right across from my place....If they were just to dig out the center of it, and spread the dirt around, then there could be a regular little lake there full time.....Nutso thing is, they continue to plant it every year with corn / soybeans, even though they know it floods at least twice a summer....
Doesn't affect me, I'm on higher ground here, but my neighbor to the West gets flooded about up to 2 feet in every one of those, and that's up around his house and yard...All this is runoff from fields to the East that are higher up.....
It's kinda neat to have the little lake sometimes, gives me something to look at other than this dark side of the moon boonerville where I live at....