At-site flood frequency statistics for unregulated streamgages in and near Virginia and West Virginia, 2025

This child item contains input files and output files for 857 rural, unregulated streamgages in and near Virginia and West Virginia processed using PeakFQ v7.5.1 for the 2025 flood frequency analysis. Additionally, results were extracted from the input and output files for in each streamgage and summaries were generated. This dataset includes: 1) "Station.zip": A subdirectory containing published annual peaks in WATSTORE format (*.pkf), specifications used for processing in Program Specification File format (*.psf), the output text file containing computation results (*.prt), and the export text file (*exp). The files within these subfolders are aggregated by 2-digit downstream order part number (01, 02, and 03) due to the limitations of maximum number of records PeakFQ v7.5.1 can process at once. At-station skew was used to compute these results. 2) "Weighted.zip": A subdirectory containing published annual peaks in WATSTORE format (*.pkf), specifications used for processing in Program Specification File format (*.psf), the output text file containing computation results (*.prt), and the export text file (*exp). The files within these subfolders are aggregated by 2-digit downstream order part number (01, 02, and 03) due to the limitations of maximum number of records PeakFQ v7.5.1 can process at once. Weighted regional skew was used to compute these results. 3) Table_3_Unregulated_Frequency_Specs.txt: Contains a summary of the specifications and statistics for at-station frequency analyses for 857 streamgages on unregulated streams in and near Virginia and West Virginia for annual peak streamflows including period of record, record length, skew specifications, thresholds and counts of PILFs, value, significance, and slope of the Mann-Kendall trend test; mean, median, and station skew for annual peak streamflows analyzed; regional skew; and MSE of station and regional skew. 4) Table_4_Unregulated_Frequency_Summary.txt: Contains a summary of the results of valid at-station frequency analyses for 813 streamgages on unregulated streams in and near Virginia and West Virginia for annual peak streamflows including flow and variance values for the 0.995, 0.667, 0.5, 0.2, 0.1, 0.04, 0.02, 0.01, 0.005, and 0.002 annual exceedance probabilities.A combination of at-station skew and weighted regional skew was used were appropriate to compute these results.

[
  "010:12"
]

[
  "geospatial"
]