Peak Streamflow, Peak Stage, and Annual Exceedance Probability Data of the July 2023 Flood in Vermont

A major rain event caused catastrophic flooding from July 9 through 12, 2023 in various portions of the State of Vermont, resulting in millions of dollars of damage. This is one of 3 datasets in a data release that documents the flood data and analyses. This part of the data release contains the peak streamflow and lake level data resulting from the July 9 through 12, 2023 flooding as well as the flood-frequency analysis that was completed implementing the Bulletin 17C guidelines (https://doi.org/10.3133/tm4B5). Flood flows were estimated for the 50-, 20-, 10-, 4-, 2-, 1-, 0.5-, and 0.2-percent annual exceedance probabilities (AEPs) for all streamgages operated in Vermont by the USGS where data was collected. This data release presents frequency analyses for 80 streamgages and 2 lake gages in Vermont and an additional 6 sites where peak streamflows were determined using indirect measurement techniques. The data release contains the input and output files for the version 7.5.1 PeakFQ software (https://water.usgs.gov/software/PeakFQ/; Veilleux and others, 2014) used to conduct flood-frequency analyses using the expected moments algorithm (England and others, 2018). The peak-flow files used as input to PeakFQ were obtained from the USGS National Water Information System (NWIS) database (https://nwis.waterdata.usgs.gov/usa/nwis/peak) and incorporate annual peak flows through water year 2023. Results of the flood-frequency analyses at streamgages that had unregulated peak streamflows were weighted with regional flood-frequency regression equation results (Olson, 2014). The flood frequency for the two lake gages was estimated using HEC-SSP version 2.2 (https://www.hec.usace.army.mil/software/hec-ssp/) because the software allows flood frequency analysis without logarithmic transformation of the data. In addition to the input and output for the PeakFQ software, this data release has four Excel tables summarizing the flood data, the flood frequency results, and a summary table of information describing the data and analysis for each streamgage.

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