On the USGS website you can find this index plot graph of stream flow between 1999 and 2006. An index value plot does not use absolute numbers. Instead, an average is taken and the start point begins at that number. It is now possible to determine from this graph when the stream flow was below or above "normal." All plotted values are relative to the index value.
Wednesday, July 9, 2008
Index Value Plot
On the USGS website you can find this index plot graph of stream flow between 1999 and 2006. An index value plot does not use absolute numbers. Instead, an average is taken and the start point begins at that number. It is now possible to determine from this graph when the stream flow was below or above "normal." All plotted values are relative to the index value.
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