An index value plot is a map that graphs index value on a line graph that is easy for comparison to what is the "normal" value based on the collected set of data. This example shows the average streamflow index in New Mexico over a decade, and the average stream flow index is at the value 4. So the USGS can use this to analyze each year on whether it has been a wet or dry year and see any variations or discrepancies from the normal.
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