Beebee, Robin A. (ORCID: 0000-0002-2976-7294) Justis, Ellen B (ORCID: 0000-0002-1780-4027) 20200603 tabular digital data Anchorage, Alaska U.S. Geological Survey, Alaska Science Center Suggested Citation: Beebee, R.A., Justis, E.B., 2020, Water surfaces elevations during an outburst flood from pressure transducers at Snow River, Alaska, 2019: U.S. Geological Survey data release, https://doi.org/10.5066/P9VVQH9D https://doi.org/10.5066/P9VVQH9D This dataset includes locations, pressure readings, and baro-corrected water surface elevations from three submersible pressure transducers deployed in the channel and floodplain of Snow River during the 2019 glacial lake outburst flood. Data from the pressure transducers was used to determine water surface elevations during a glacial outburst flood in August, 2019 and to verify a hydrodynamic model of the outburst flood. 20190820 20190826 observed Complete None planned -149.34500 -149.33200 60.33400 60.28600 USGS Metadata Identifier USGS:ASC271 ISO 19115 Topic Category InlandWaters NASA GCMD Earth Science Keyword Thesaurus Flood plain River Ice-dammed lakes USGS Thesaurus Hydrology Floods USGS Geographic Names Information System Alaska Snow River No access constraints. No use constraints. These data are marked with a Creative Common CC0 1.0 Universal License and are in the public domain. It is requested that this USGS data release be cited for any subsequent publications that reference or utilize these data. Users are advised to read the dataset's metadata thoroughly to understand appropriate use and data limitations. U.S. Geological Survey, Alaska Science Center Mailing and Physical

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Anchorage Alaska 99508 USA 907-786-7000 gs-ak_asc_datamanagers@usgs.gov The Alaska Railroad Corporation provided funding to collect and analyze these data Windows 10, Hoboware v. 3.7 Beebee, R.A. 2022 publication U.S. Geological Survey Scientific Investigations Report 2022–5099 online U.S. Geological Survey Beebee, R.A., 2022, Recent history of glacial lake outburst floods, analysis of channel changes, and development of a two-dimensional flow and sediment transport model of the Snow River near Seward, Alaska: U.S. Geological Survey Scientific Investigations Report 2022–5099, 39 p., https://doi.org/10.3133/sir20225099 https://doi.org/10.3133/sir20225099 The accuracy of depths/water surface elevations was not tested in the field as the sensors were deployed out of water and were not accessible during the flood when they were submerged. However, data were compared to each other and with a nearby stream gage and appear consistent. The manufacturer states that instruments are accurate to 0.01 feet. Attribute values fall within expected ranges. The dataset is complete, no data were omitted. Horizontal coordinates are accurate within about 10 feet, consistent with the 5-minute average location accuracy of a recreational grade GPS. METHODS - FIELD: Data from the submerged U20 pressure transducers and from a non-submerged U20L transducer were downloaded. Onset HOBOWare software was used to correct the submerged transducer data for atmospheric pressure fluctuations recorded by the non-submerged transducer. Cages holding the HOBO U20 pressure transducers were surveyed to known elevation points on bridge plans using a level and stadia rod. The elevation of the pressure transducer and the recorded depths were used to compute a time-series of water-surface elevation. Unknown Point State Plane Coordinate System 1983 0004 0.9999 -150.0 54.0 1640416.6666667 0 coordinate pair 1 1 survey feet North American Datum of 1983 (NAD 83) Geodetic Reference System 1980 (GRS80) 6378137 298.257222 North American Vertical Datum of 1988 0.10 feet Explicit elevation coordinate included with horizontal coordinates pressureTransducer_coordinates_outburstFlood_snowRvr_2019_beebee.csv Table with the position (horizontal and vertical), serial number, and location name of each pressure transducer deployed. Presented in a Comma Separated Value (CSV) formatted table. Author defined PT_Name Name given to each pressure transducer deployed Author defined Each name is referenced to the nearest bridge (605 is the Seward highway bridge, 145 is the railroad bridge at railroad milepost 14.5, and 152 is the rail bridge at railroad MP 15.2). Northing_ft The y-coordinate of the transducer location Author defined 2296861.0 2314474.0 feet 1 Easting_ft X-coordinate of the pressure transducer Author defined 1758461.0 1760878.0 feet 1 PT_Elevation_ft The elevation of the pressure transducer in NAVD88 Author defined 441.3 483.8 feet 0.1 SN Serial number of the transducer Author defined These are the unique serial numbers given to each HOBO U20 unit by the manufacturer pressureTransducer_[PT_Name]_outburstFlood_snowRvr_2019_beebee.csv Pressure transducer data for each transducer. Each table is named using the PT_Name corresponding to the nearest bridge. Presented in a Comma Separated Value (CSV) formatted table. Author defined Date_Time The date and time of the transducer measurement. Time is 8 hours minus Greenwich Mean Time (GMT) or Alaska Daylight Time (AKDT). Author defined 8/20/2019 1:00 8/26/2019 10:00 Abs_Pres_psi The absolute pressure measured by the submerged pressure transducer Author defined 14.46 17.74 pounds per square inch Abs_Pres_Barom_psi The atmospheric pressure measured by transducer used to correct for atmospheric pressure variations. Author defined 14.25 14.52 pounds per square inch BaroCorrectedWaterDepth_ft The depth of water, in feet, computed by the HOBOware software after barometric pressure compensation. Author defined 0.0 7.9 feet WSE_ft Water surface elevation computed by adding the elevation of the pressure transducer to the corrected depth. Author defined 441.3 491.7 feet U.S. Geological Survey USGS ScienceBase Team Mailing and Physical

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Denver Colorado 80225 USA 1-888-275-8747 sciencebase@usgs.gov The U.S. Geological Survey, Alaska Science Center is the authoritative source of these data, distributed by ScienceBase (a USGS Trusted Digital Repository). 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, no warranty expressed or implied is made regarding the display or utility of the data for other purposes or on all computer systems, nor shall the act of distribution constitute any such warranty. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. CSV Tabular data in CSV format; FGDC metadata in XML and HTML formats. https://doi.org/10.5066/P9VVQH9D None 20250511 U.S. Geological Survey, Alaska Science Center Mailing and Physical

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Anchorage Alaska 99508 USA 907-786-7000 gs-ak_asc_datamanagers@usgs.gov FGDC Content Standard for Digital Geospatial Metadata (CSDGM) FGDC-STD-001-1998