I have three ponds on my rural property, and I wouldn't take nuthin' for them
. My little slice of paradise. I don't think what you are proposing will work out as you think however...if sunlight can reach the bottom, stuff's gonna grow, and you will have a mess to maintain, and a stagnant skeeter hole.....go deep or don't. My smallest, lower pond is about the size you're talkin' about and is no more than 3-4 deep right now....cause the damn muskrats breached the berm on one side and drained most of it
. I'm just about ready to fill the breach and let her rise back up another 4-5 feet. My largest pond (outflows to the middle one) covers a spring that I have seen once....when I as a child, but it's a good spring....the outflow can be as much as a garden hose on full blast to a fire hose....the land is sitting right on top of the aquifer. My great-grandfather's well was/is 24' deep with 18' of water in it.....you need a GOOD spring imo or you will just have a mudhole. If you do build a damn, I'd suggest a (capped from inside the pond) 4" pvc pipe through the damn below the water line so you have an easy way to lower the water level. The primary outflow can be 4", but you need a large one a bit higher for overflow purposes as pipes get clogged too....all pass through the dam. Ponds are ecosystems...I love 'em
. Today I watched itty-bitty fish fry spewing up from the fish spawning beds like a volcano erupting...never seen that before....amazing!
I'm tired of typing.....but could go on...
I did hook a whopper bass this morning....reeled for a minute or so before she got in the grasses and shook my barbless hook out...oh well