I'm going to have to wait a week or 2 before I get around to this so, I'm still soliciting opinions.
Just got back from another 2 hours labor clearing my drain box to get it ready for installing the shutters.
Weird how I have to keep dropping the water level in my pond to get ready to put in the shutters that will let me get it back up to where I want it. I've got it almost 4 feet below what I want right now. When I put in the shutters, I'll get it back. But, there was so much built up debris and mud, I can't install the shutters until I get it all cleared out.