An acquaintance bought one of those swings with an awning cover. It sticks out from their roof overhang by a couple feet. Since buying this, they get water in the basement. The awning is adjustable by loosening and tightening a couple large knobs. "When you know it is going to rain heavy, why don't you just tilt it forward and away from the house rather than keeping it tilted back and towards the house?" "Eh, it's only a little bit. That's not why we're getting water in the basement."
So, I looked it up. Just last night, we got 2-3 inches in an hour. "An inch of rainfall on a square foot of surface area yields . 623 gallons." I'm guessing this person has around 10-12 square feet of awning funneling water towards the house. Yeah, you got water in your basement because of that awning, buddy.