Haylie Brown Nicholas J. Taylor Mark A. Cedar Face Seth A. Siefken 20260408 Attached zipped files https://doi.org/10.5066/P14TA8CK Seth A. Siefken Tara Williams-Sether Nancy A. Barth Katherine J. Chase Mark A. Cedar Face 2025 publication Scientific Investigations Report 2025-5019 Reston, Virginia US Geological Survey https://doi.org/10.3133/sir20255019 This data release contains results of peak-flow frequency analyses for selected streamgages in the Souris River Basin in North Dakota along with information documenting the input data and specifications for the analyses. The analyses were performed using the methods described by Siefken and others (2025). Provide specifications and peak-flow data input to the U.S. Geological Survey peakfq software package used for peak-flow frequency analyses, and results of analyses per delineated basins in North Dakota. 1883 2022 ground condition Complete None planned -104.2163 -96.4325 49.0667 45.8441 ISO 19115 Topic Category inlandWaters General peak-flow frequency annual exceedance probability streamflow hydrology USGS Thesaurus computational methods statistical analysis time series analysis stream-gage measurement hydrologic processes floods streamflow hazards hazard preparedness watershed management USGS Metadata Identifier USGS:69375442d4be0207e913aea6 North Dakota basins Souris River Common geographic areas Land North America United States North Dakota none None. Users are advised to read the dataset's metadata thoroughly to understand appropriate use and data limitations. Haylie Brown U.S. Geological Survey Wyoming-Montana Water Science Hydrologist mailing and physical

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Helena MT 59601 USA 406-475-4535 hbrown@usgs.gov This analysis was completed by the U.S. Geological Survey, in cooperation with the North Dakota Department of Water Resources. Created using Microsoft Excel 365 running on Windows 11. John F. England Timothy A. Cohn Beth A. Faber Jery R. Stedinger Wilbert O. Thomas Andrea G. Veilleux Julie E. Kiang Robert R. Mason, 2019 publication Techniques and Methods book 4, chap. B5, 148 p. Reston, Virginia US Geological Survey https://doi.org/10.3133/tm4B5 U.S. Geological Survey 2025 application/service https://waterdata.usgs.gov/nwis Veilleux, A.G., Cohn, T.A., Flynn, K.M., Mason, R.R., Jr., and Hummel, P.R. 2014 publication U.S. Geological Survey Fact Sheet 2013-3108 Reston, Virginia U.S. Geological Survey https://water.usgs.gov/software/PeakFQ/ No formal attribute accuracy tests were conducted No formal logical accuracy tests were conducted Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. No formal positional accuracy tests were conducted, but latitude and longitude values will inherit the accuracy of the source dataset (National Water Information System). No formal positional accuracy tests were conducted U.S. Geological Survey 2022 application/service Reston, Virginia U.S. Geological Survey https://nwis.waterdata.usgs.gov/usa/nwis/peak annual peak-flow data 1937 2022 see dates Peak-flow data Dates and magnitudes of peak flows for each gage PeakFQ version 8.1.0 was used to generate peak-flow frequency estimates using the specifications and peak-flow data files included in this data release. The input peak-flow data, specifications, and peak-flow frequency estimates are presented in attached files. 2025 1.0E-4 1.0E-4 Decimal degrees North American Datum of 1983 (NAD 83) Geodetic Reference System 1980 6378137.000000 298.257222 Attached zipped files containing metadata, input data files, and results. See each attached zipped file for specifics regarding .psf file, Watstore file and excel sheet. Brown, H., Taylor, N.J., Cedar Face, M.A., and Siefken, S. A., 2026, Results of peak-flow frequency analyses for selected streamgages in the Souris River basin in North Dakota: U.S. Geological Survey data release, https://doi.org/10.5066/P14TA8CK. U.S. Geological Survey - ScienceBase mailing address

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Denver CO 80225 1-888-275-8747 sciencebase@usgs.gov Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. Digital Data https://doi.org/10.5066/P14TA8CK None 20260409 Haylie Brown U.S. Geological Survey Hydrologist mailing and physical

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Helena MT 59601 USA 406-475-4535 hbrown@usgs.gov FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998