Streamgages considered for analysis, results of redundancy screen, and comparison of computed frequency results for streamgages in and near Virginia and West Virginia, 2025

This child item contains miscellaneous data files and information used in the estimation of the magnitude and frequency of floods for rural, unregulated streams in Virginia and West Virginia (Messinger and others, 2025). The initial data retrieval from the U.S. Geological Survey (USGS) National Water Information System (NWIS) database (U.S. Geological Survey, 2022) contained 1050 streamgages in Virginia, West Virginia, and adjacent 8-digit hydrologic units that were considered for this analysis but a subset of streamgages were excluded during different stages of the study for various reasons. Datasets in this child item include: 1) Table_1_Streamgages_Considered.txt: Contains the original 1050 streamgages and summarizes the stages of the analysis in which they were included in or excluded from the study. Reasons for exclusion included small drainage basins (less than 0.200 square miles), large drainage basins (greater than 3,000 square miles), or a large percentage of developed land use (equal to or greater than 30 percent) within the drainage basin. This table also indicates if a streamgage has periods of record defined as regulated, unregulated, or both. 2) Table_2_Miscellaneous_Exclusions.txt: Contains a list of streamgages that were excluded from the study for miscellaneous reasons during exploratory analysis. Reasons varied but were primarily because of insufficient data to compute a valid frequency analysis or streamgages that were determined to exceed the acceptable regulation index (0.0040). 3) Table_8_Redundancy_Screen.txt: Contains a subset of streamgages that were identified as potentially redundant in the regression analysis. This table provides the information used to compare these streamgages and the exclusions based on the comparison. 4) Table_20_Last_Cycle_Discharge_Comparison.txt: Provides a comparison of at-site and regression-weighted streamflow computations for the 0.01 annual exceedance probability determined by this analysis and previous regional analyses at 560 applicable streamgages. 5) Map_Index_ID_Numbers.txt: Contains a list of streamgages considered in the flood-frequency and used in the skew analysis and their associated labels used in the map figures within the manuscript.

[
  "010:12"
]

[
  "geospatial"
]