5cm/s = kelajuan paras air naik di Perlis.

Fixed.

I always find makoto shinkai's work beautiful, though I think the presentation of the story theme rather vague. I prefer satoshi kon's storytelling method.

Actually it is that fast at someplaces, even faster even. Some people were wading through knee deep water when suddenly it became more than waist deep, that's how some people got swept away in the flood. Definitely more than 5cm/s.