One way to deal with flooding is to build highways in a manner where they become channels in such events. Kuala Lumpur, for example, has their SMART tunnel[1] which acts as a roadway normally but can be turned into a stormwater drainage tunnels.
Houston had a prime opportunity in 1996 to do something similar[2] when I-10 W was rebuilt- and engineers recommended building a conduit under I-10 to carry flood water from the Barker and Addicks reservoirs to the ship channel. Alas, that proposal was ignored so West Houston flooded during Harvey.
https://en.wikipedia.org/wiki/SMART_Tunnel
https://www.dallasnews.com/news/harvey/2017/09/05/houston-gr...