@Erte said:
… the “catchment bucket” [rainhead? sorry, don’t know proper term] that would normally feed the water into the down pipe and into the drain has fallen off at some stage. So the water pours directly onto the path below …
You need to get your strata committee to fix that as a matter of urgency.
I used to own a unit in a block where the neighbours didn’t properly repair their downpipe drain, the rain ran on to the concrete path and was then run off into the grass and soil near our side of the path.
Nobody cared or thought anything was amiss … until the whole of that corner of our building started to sink. The occasional concentration of water was enough to undermine the foundations at that spot. Admittedly ours was an old building that hadn’t been particularly well constructed but that’s not the way you want to find out.
Get your committee to fix it pronto.