Figure 2

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Figure 2. (a) This sediment rating curve shows one year of data for a single station. The hysteresis in the plot and the variability in sediment concentrations for a given discharge show that the data are collected daily. Hysteresis is when the sediment carried by the river for a given discharge is different when discharge is rising than when it is falling. This happens because as water levels are rising the river first has to mobilize big stuff on the bottom of the river in order to get to the smaller stuff. Once the big stuff is mobilized, the smaller grains are easier to pick up. The river then carries more sediment as the water level falls because the river already has all the smaller grains in suspension. (b)The locations of each station are not given exactly, so we had to make a best guess based on river names and upstream areas. Given the close correlation between the reported and calculated upstream area, we think we did a pretty good job with guessing locations.

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