Hey Brettski,
There are two culverts. This one is 15 inches and the small one. It doesn't get very much runnoff, but the speed of the water coming to it is pretty severe.
The other culvert is 18 inches and it gets about ten to 12 acres, give or take. It's kind of tricky guessing which way the water will go and how much my roads will divert to this culvert. The water comes through a wooded area and kind of snakes around some good sized trees before it gets to this culver, so even though it gets allot more water, it's comeing at the culvert allot slower.
The main water source is from an open trench, dry creekbed that runs along my Western boundry. This gets the runnoff that breaks away from the 10 or so acres that feeds the large culvert, plus the land on the other side of the property line and then the land above my property.
This could be getting anywhere from 20 to 40 acres. It's heavily wooded and dificult to tell where the water changes directions on it's way to the drainage.
The drainage, or dry creekbed, has been there forever. It's one of the reasons that I based my size of the lake and it's location.
Eddie
