In Wyoming, we are lucky to get a foot all year. In the summer through fall, we frequently get less than an inch, although this year we a little rain regularly into early August, so we are green compared to normal and some of our reservoirs, that are normally bone dry by July, still have water in them. Four feet annual rainfall sounds wonderful until I think about what happens with our elevation changes when we get a big rain.

When I lived in Florida, if you got an inch of rain, there was a little less than an inch of water everywhere because the land was flat. It also drained fast since the ground was mostly sand. In Wyoming, when we get an inch of rain, we get damaging runoff and lowlands can have more than a foot of water. There is one low spot on the interstate, that runs under 2 overpasses (one for cars and one for trains). There is no place for runoff to go. When we get a big rain, it is unpassable. I've learned to avoid the spot if we get any significant amount of rain (> 1/2 in).