They do. If roofs are leaking that means drainage issues. Given the freezing/thaw, not surprising that flat roof drainage is being backed up. also, flat roofs have a rubber-tar sealing compound in place of shingles, so makes me wonder about the age and what gaps occurred in the sealing.

edit to add https://www.pressherald.com/2023/01/26/third-storm-in-a-week-brings-more-outages-flooding-messy-mix/

>Deputy Chief Brennan said both Scarborough stores’ drainage systems were working, but were apparently overwhelmed by the weight of accumulated snow, saturated by the rain that fell overnight.

snow or rain is fine, when you get one then the other, it weighs a shit ton and goes nowhere fast.