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Notes:

The statistical values are then used to generate a probability plot. Note that a specific daily flow can be assigned an exceedance value. Take, for example, July 15th. There is a very good chance, greater than 90 percent, that the future flow will be greater than 77 flow units. There is a 75 to 90 percent chance that the flow will be greater than 154 flow units. Likewise, the observed flow has a 25 to 50 percent chance of being greater than 231 flow units. Finally, at the extreme end, the future flow has less than a 10 percent of being at 385 flow units.