I'm installing a 500 sq ft paver patio that is bounded by the house and garage (see pic). At the end of this patio will be a freestanding courtyard wall (Allan Block Country Courtyard) and attached raised fire pit. The slope of the patio will run directly to the middle of this wall. I assume I need to provide some form of drainage for this area? I was thinking of 4" surface grates in the small nook areas on both sides of the fire pit. You guys think this is the best option? If so, I would run the pvc straight down under the base material and wall and run it out approximately 30 feet to a pop-up emitter by the curb. Does the raised fire pit also need some form of drain? Any insight would be greatly appreciated.