Based on this annotated image, can I reasonably pour concrete over the existing gravel in this carport area? If no, would it be enough to add another 1-2 inches of fresh gravel first?
Some details. I'm supposing a depth of 4 inches with wire reinforcement. Also, I would dig down about eight inches in an 18-24 inch wide "lip", with additional gravel and rebar reinforcement, where the concrete slopes down to the asphalt drive. The area to the right leading to the stairs would also be dug and graveled, just not as deep.
I've considered the drainage implications and I'm satisfied with the french drain on the right. However I'm thinking the channel drain is not necessary.. or if installed, should be pitched so the flow goes to the right and NOT the left as I have shown it. (oops)
Should I worry about catching and channeling water between the concrete and the brick surfaces where they meet...particularly on the left side where there is no eave to prevent precipitation from entering the carport?