Thanks MiraB ... Once again, this is amazing what we learn about other parts of the world!
They use the same 100 yr reference here ... when constructing storm measures here, then every once awhile we get some close together events and everyone laughs, yea right as though it'll wait 200 or 300 yrs! Thankfully we don;t see the same flooding as you deal with.
Let's hope that this year is not one of those high tide and heavy rain seasons for you!