system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 how are tall buildings drained when rain falls at an angle?

When rain falls at an angle and it hits the side of a building, where does the water drain? Given the volume of the rain that falls, is the water somehow drawn into internal drainage  via guttering all down the building or does it just sheet down to the ground?
gpt
It just slides down the outside of the building to ground level, at which point the same drains that cope with the rain that hasn't hit a building first deal with it. Just because it hit a building on its way to the ground doesn't change anything.