I have 2 concrete small slabs (2m x 5m) that are sloped with 1.5% ending in the wall of the lower floor, 3 sides of the slabs have walls (just the low level doesn't). What is the best course of action to deal with this rain water?
Can I just let it run along the wall below?
Should I build a small (10cm) wall in the open end and use a scupper or some other thing?
I don't want to use gutter because I will need to put a ladder against it from time to time for maintenance.