There are terrorists attacks monthly in Europe (you don't get the headlines here in the US, and often, the 'attacks' are individuals with knives on trains, or who attack a single family so they don't get attention) - and European governments are really in a difficult situation - they don't know what to do. So this mandate kind of a 'knee jerk reaction' to some extent, possibly even 'political cover' so that they seem as though they are doing something, if you want a cynical take.
The North Sea coast, where I live here in Germany 100km away, has always seen floods and violent storms. Additionally there are floods from heavy rains in the Elbe region. I live in such a region, where such a flood is possible.
Germany has disaster protection plans. It has organizations to provide help, like the THW. Etc. etc. The plan mentioned here has been in preparation for several years now.
The plans have nothing to do with knife attacks in trains. You are clearly clueless about this government paper.
You have no idea what you are talking about.
Germany has floods, snow storms, etc. The government has to think about disaster protection and what it means in a modern society, which depends on concepts like 'always on'. Plans are twenty years old and need to be updated.
A few years ago there were some parts of Germany without electricity for a few days and some were not reachable, because of a winter storm, which damaged large power lines.
https://en.m.wikipedia.org/wiki/Kyrill_(storm)
Example for a flood: https://en.wikipedia.org/wiki/2002_European_floods