Graph both data sets on the same graph (time=x, flow speed= y). Assuming there is a direct correlation between up and downstream data, a peak in the first set will show a peak in the second set a certain amount of time down the graph. The distance between the peaks should be a function of how fast the water was moving in the first set, as the distance between the measuring stations is constant.

That should be easy… now we have to figure out how to throw GP into the mix.

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