In some parts of Austria, you don’t have to be scared of massive floodings!
Their engineers have indeed developped mobile flood walls! And this technology is so perfect the water level can go terrifyingly close to the top of that wall! Mind-blowing!
Back in 2013, apocalytical floods hit central Europe devastating mainly south and east German states, western regions of the Czech Republic and Austria.
In some parts of Austria, particularly around Grein, they installed mobile-bearing walls to protect themselves and their habitations from the impending flood. Look the video… It’s damn impressive! The water is terrifyingly close to the top of that wall:
Of course, there are also permanent walls existing. For example, in Sunbury PA, a flood wall was built along the edge of the Susquehanna River after a bad flood hit the town in 1936. The wall was finished in 1951. Since then it has protected the town from two other major floods. This picture of the protective wall was taken in 1972 after hurricane Agnes hit. This is what it normally looks like, peaceful.