I’m talking about big vertical-walled glass-sided skyscrapers like [this one](https://en.wikipedia.org/wiki/22_Bishopsgate) or [this one](https://en.wikipedia.org/wiki/8_Canada_Square). When it rains, the vertical sides of these must catch a lot of rain, which runs down the windows. So by the bottom of the building you should get the accumulated water catchment of the 50+ storeys above, which would be a pretty significant amount of water (I assume). How do these buildings manage the water hitting their sides and running down so that it doesn’t completely drench everyone on the street?
I appreciate other buildings without smooth glass sides have opportunities to capture water as it falls down the building (like [this one](https://en.wikipedia.org/wiki/122_Leadenhall_Street)) but was walking through London in the rain today wondering why I wasn’t getting wetter.
In: Engineering
The water is collected into pipes and then discharged into the environment. In some cities you can connect into storm drains, but often you discharge it onto the street.
It only takes a small seam in the glass to let the water curl under and into a collection pipe. From the ground you can’t see the seams.
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