The overflow is concrete, about 8 x 6 with a small notch about 1' across. Normal times the flow is such fish can't get out, it's just when the big rains hit and we have a lot of water moving. Having said that I guess it is only 3-4 inches above the overflow.
I wondered about making some sort of screen but was fairly certain it would be a nightmare trying to keep it clean.
With what you see and what I have said is stocking some tilapia an option?
