What is the minimum extent of sea level rise that has to occur to severely impact a coastal city?

Oiy2020-11-17T11:10:48Z

In fact, the coastal cities sink at least 10 cm a year. It is faster than the rise of a sea level. Maldives would be under sea water in ten years for example.

JuanB2020-11-16T22:01:56Z

It depends if that coastal city is in the hurricane zones.  The extra flooding already coming from the punch of hurricanes would be considered a severely impacted city.