. . . .
How much of the population was forced to camp in the woods?
Pretty close to 0.
BOB goes to the jungle and TEOTW scenarios are popular...and wildly unlikely.
I like to use the past decade as a guide -- if an event happened in my area and how often -- and plan for likely events; not black swans.
. . . .
Did you ever hear about the statistician who drowned in an average of 6 inches of water?