Which disaster?

I'm very confused heavy rain attached North West Japan and many houses and cars were drifted. Hundred thousands of people had to take refuge.
I found no word for that cruel disaster. Just wondering why so many disasters happen in Japan!
I can't tell why but better to avoid next disasters…one after another.

We never forget natural disasters are near us but human disasters are also with us.
They occur complicated to annoy us.
Our life should be altered to fit in nature by stopping destroying nature.
But our modern life needs to construct roads and buildings invading nature.
We should know humans' profit is not profitable but harmful to the nature.
We can't live without cultivated artificial life but natural disaster itself caused by human disaster…I think.