Ah ok, got it.
Oh we have that already. The Maeslantkering was finished 25 years ago and was made to stop 16ft surges. It stops the waves from surging up river and flooding Rotterdam in case of extreme weather. Everything else is just dunes doing dunes stuff. And of course we also have the Oosterscheldekering, that is made to stop 19 feet surges. Its not a small project of course, I mean the Maeslantkering is one of the biggest moving structures in the world (the balls-shaped joint is the biggest in the world at 680 tons each) and the Oosterscheldekering is 5.6 miles long. You can say we did a little bit of engineering there (the acceptable risk was set at
1 failure (=flooding) per 10000 years for populated areas). It only took one really bad storm for people to decide to just go and fix it. I simply can't image a country getting flooded by storm surges every couple of years and not taking actual action.
Rain is a bitch, especially if you turn everything into concrete. But for rivers you just have floodplains. Doesn't stop everything, but will make things a little more manageable. I'm pretty sure Florida has those, what happened there?