This old house has some weird, non-standard downspouts. Flat roof, no gutter, so the roof slopes to an opening in the wall. The main house has a downspout connected, but the garage doesn't. In both cases, the shapes are not at all normal downspout profiles, so I'm not sure how I can properly prep this to drain farther from the foundation. (Right now even a moderate rain leads to a small leak in the garage.) The garage's drain is a 5x5" sheet metal square.
Anyone have any experience with this kind of set up?