I'm probably reading too much into the streams. They are probably not flowing like how I imagine a "stream" would flow. For instance, there is a pipe under the railway and then the water flows across another stream and somehow continues to flow into a dead end (https://www.openstreetmap.org/way/1148274234). That just doesn't seem likely, but I suppose it kind of just floods and doesn't really move around at that end. I'll close this note as it isn't crucial.