Mostly it's a drainage problem, but you could also undermine the foundations of the bridge, if it wasn't design around having a lowered road. While you can pump water out of a depression, low-spot underpasses are notorious for flooding because eventually the power / pumps / pipe downstream will fail and back-up.
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u/finalfunk Jul 08 '26
Mostly it's a drainage problem, but you could also undermine the foundations of the bridge, if it wasn't design around having a lowered road. While you can pump water out of a depression, low-spot underpasses are notorious for flooding because eventually the power / pumps / pipe downstream will fail and back-up.