Basin Centroid Points for Unregulated Streamgagages in and near West Virginia 1930-2011

Correlation of flows at pairs of streamgages were evaluated using a Spearman’s rho correlation coefficient to better identify gages that can be used as index gages to estimate daily flow at ungaged stream sites in West Virginia. Correlation maps were developed for each candidate index streamgage using ordinary kriging, and have been compiled as grids. Sets of grids were developed for correlation of daily flows of streamgages on unregulated streams in and near (within 50 miles of) West Virginia that were operated during the 1930-2011 water years for:
(1) complete water years for the entire period of record (1930-2011),
(2) October-December for the entire period of record,
(3) January-March for the entire period of record,
(4) April-June for the entire period of record,
(5) July-September for the entire period of record,
(6) complete water years for 1963-1969,
(7) complete water years for 1970-1979, and
(8) complete water years for 1992-2011.

Details of analytical approach, results, discussion, and limitations are contained in the U.S. Geological Survey Scientific Investigations Report 2014-5061.