Expanded shifted ratings and estimated provisional streamflow for streamgages in the Potomac River Basin in Virginia, water years 1991 through 2013

Estimated provisional streamflow values (Messinger and Burgholzer, 2017) for streamgages in Potomac River Basin and the shifted, expanded ratings that were used to develop them are included in this dataset. This file contains source data, daily streamflow records and selected ratings that had been saved in the National Water Information Service database for water years 1991-2013. Microsoft Excel formulas that were used to compute the estimated provisional streamflow (AltFlow) tables are included, and may be used to extend the AltFlow record following the procedure described by Messinger and Burgholzer (2017), in Appendix 2. This release also contains the existing AltFlow record for the same streamgages in comma-separated variable (csv) format.