[data cleanup] Closing date was missing and has been provided by the system as a best guess

It looks to me like a 24 inch diameter pipe will be sufficient to handle the flow in the area you are proposing to fill for a parking lot expansion. I think a 15 foot drainage easement should be platted for the pipe, and, as I said during out site inspection, the minimum elevation in the parking lot should be a least one foot below the shoulder elevation of Fairfax Rd. to provide and overflow route should the pipe become clogged.