Climate change isnt the only reason for flooding:

"Some of the world’s expanding coastal cities face a two-pronged threat involving water: Sticking giant straws into the ground to suck up freshwater can cause the ground below to sink at the same time that sea levels are rising.
That interplay between subsiding land and rising seas highlights an underappreciated risk in global climate change, according to scientists."
[www.nbcnews.com]