this is mississippi river, the actual flow at saint louis. the data comes from the armed corporation to around the year 2000, to 2001. if you draw a straight line here, the straight red line is basically the flood risk, assume this record is stationary that the climate is not changing. in fact, statistically, if you ⌜"at this record, it's not stationary. average flow in the mississippi river seems to be going on. i don't know if it's climate change but its the kind of thing that makes long-term planning managers nervous. one is the model you plan for the average flood over the last historical record or potentially the tree ring record or whether you assume climate is not stationary and in which case, the model of what you do and the assumptions, and the conclusions of what you do will all be different. so what has been done? well, i don't think a whole lot. a lot of the thinking and a lot of things have been done in modeling and planning but in terms of on ground action, not much is done. i know city of san francisco is re-evaluating storm wa