It’s someone who designs infrastructure, so roads, buildings, bridges, sewer systems, etc. Basically if you think about anything a construction worker builds, a civil engineer/team of engineers designed it. There are different categories of civil engineers. Structural engineers make sure a building can handle the weight of everything on/in it. Transportation engineers design highways. I’m a geotechnical engineer, so I deal with soils (dirt) and make sure the ground can support whatever is being built.
Buy flood insurance and if it gets too expensive, it might make more sense to move. I live in an area where flood insurance just skyrocketed and I think people are still hoping prices will go down somehow but I don’t think it’ll happen.
If you’re handy, maybe look into how to gut a house after a flood. Mold can do a lot of damage.
I don’t know if you’re in an area where flooding could be a safety issue but always follow local warnings/official’s advice. Property can be replaced, people can’t.
I think as humans we can engineer our way out of increasingly hostile weather but it takes an investment of time and money and our governments aren’t usually great at either.