via videosift.com
A really interesting video that shows the process of a road being destroyed by a surge of water perhaps caused by the drainage under the road being blocked by the tree from what I gather. It's a little long but there are certainly a few wow moments in it.
I wonder if there is a standard that road workers must follow when placing those courrogated draiage pipes based on CFM of runoff plus a safety margin, or if it is just a bunch of guesswork.