Explanation of the Streamflow Conditions Plots

The cumulative percentage plot shows, for each day, the percentage of long-term (30 years or more of historical data) streamgages in each of the flow percentile classes listed in the Explanation. The plot is a graphical representation of the data in the Summary Table.

The streamflow index value at a station compares the daily streamflow value to historical values for the day of the year.

Important Note: Gaps in the red line occur on days when less than two-thirds of the maximum number of stations in the state report data. On these days, confidence in the plot value is substantially reduced, and may even misrepresent actual conditions. To avoid potential bias in the presentation, no value is plotted for these days. The loss of data is usually related to equipment failure, computer problems, or telecommunications difficulties. Occasionally, widespread flooding events can disrupt data acquisition at a large number of station