|By the 2080s, in a worst case scenario (in which sea level rises by nearly 3.6 feet for some NYC coasts), those areas that now would be inundated by a 100-year flood (that is, a flood with a recurrence interval = 100 years) instead could be flooded (on average) every four years. That is, by the 2080s, a line that marks the floodwater limits for what is now a 100-year flood, would mark the limits of a four-year flood. ||Remember that when a storm surge occurs, the rise in water level is always added to whatever is the sea level at that time. Thus, in the future, for example, if sea level rises by 2 feet, then a 10 foot storm surge would inundate areas that today have elevations up to 12 feet.
Assume that by the 2080s, sea level rises by nearly 3.6 feet. By how many feet would a storm surge have to raise the level of the water to flood areas that today are less than 10 feet in elevation?
By *_______ feet (to the nearest tenth of a foot).
At Site 3 in Manhattan, what is the percent chance annually for such a storm surge?
The percent chance annually is *______%.
What is the recurrence interval for such a storm surge? The recurrence interval is *_______ years.