Yeah, floodfactor is a great tool.

In a similar vein, check out geological surveys for karsts and sinkholes if you live in an area where bedrock is comprised of soluble rocks (which is much of populated earth). I know this seems outrageous, but increased rainfall doesn't just flood creeks and rivers, it can overload sewage systems. And if an overloaded sewage system means water has to find it's own way.

This doesn't just effect your house. Think about the impact of a road to your house sinks. IME, these can take months to get fixed.