According to the simulation what is the experimental probability of a flood in bay city in at least 1 of the next 5 decades ?

In order to answer that, it would really be helpful if we knew
the results of the simulation.  Right now, the only thing we know
about the simulation is that, apparently, there WAS one. 

If you were planning to ask a question about it, seems to me that
it was your responsibility to give us all the information we would need
from which to build a reasonable, logical, informed answer.  Sadly,
you fell down on that job.