Data in support of flood-frequency report—Magnitude and Frequency of Floods on Kauaʻi, Oʻahu, Molokaʻi, Maui, and Hawaiʻi, State of Hawaiʻi, Based on Data through Water Year 2020
Dates
Publication Date
2023-04-28
Time Period
2023
Citation
Mitchell, J.N., and Wagner, D.M., 2023, Data in support of flood-frequency report—Magnitude and Frequency of Floods on Kauaʻi, Oʻahu, Molokaʻi, Maui, and Hawaiʻi, State of Hawaiʻi, Based on Data through Water Year 2020: U.S. Geological Survey data release, https://doi.org/10.5066/P9GGPPV5.
Summary
The U.S. Geological Survey (USGS), in cooperation with the State of Hawaiʻi Department of Transportation, estimated flood magnitudes for the 50-, 20-, 10-, 4-, 2-, 1-, 0.5-, and 0.2-percent annual exceedance probabilities (AEP) for unregulated streamgages in Kauaʻi, Oʻahu, Molokaʻi, Maui, and Hawaiʻi, State of Hawaiʻi, using data through water year 2020. Regression equations which can be used to estimate flood magnitude and associated frequency at ungaged streams were developed. The methods and results of the study are published in a separate report (https://doi.org/10.3133/sir20235014). This data release contains data supporting the larger work: (1) PeakFQ inputs and selected outputs for 238 selected streamgages in Hawaiʻi; (2) inputs [...]
Summary
The U.S. Geological Survey (USGS), in cooperation with the State of Hawaiʻi Department of Transportation, estimated flood magnitudes for the 50-, 20-, 10-, 4-, 2-, 1-, 0.5-, and 0.2-percent annual exceedance probabilities (AEP) for unregulated streamgages in Kauaʻi, Oʻahu, Molokaʻi, Maui, and Hawaiʻi, State of Hawaiʻi, using data through water year 2020. Regression equations which can be used to estimate flood magnitude and associated frequency at ungaged streams were developed. The methods and results of the study are published in a separate report (https://doi.org/10.3133/sir20235014). This data release contains data supporting the larger work: (1) PeakFQ inputs and selected outputs for 238 selected streamgages in Hawaiʻi; (2) inputs and outputs for the USGS weighted-multiple-linear regression (WREG) program used to develop the regional regression equations; (3) geospatial data supporting the report, including basin delineations, basin characteristics, and regional regression boundaries; and (4) selected appendices from the larger work. These data can be used to reproduce the results in the larger work: Magnitude and Frequency of Floods on Kauaʻi, Oʻahu, Molokaʻi, Maui, and Hawaiʻi, State of Hawaiʻi, Based on Data through Water Year 2020.
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Related External Resources
Type: Related Primary Publication
Mitchell, J.N., Wagner, D.M., and Veilleux, A.G., 2023, Magnitude and frequency of floods on Kauaʻi, Oʻahu, Molokaʻi, Maui, and Hawaiʻi, State of Hawaiʻi, based on data through water year 2020: Scientific Investigations Report, https://doi.org/10.3133/sir20235014.
The purpose of the data release is to provide supporting data that can help reproduce the results of the study. The purpose of the larger work is to present methods and results for estimating the magnitude and frequency of floods for unregulated streams on five of the main Hawaiian Islands: Kauaʻi, Oʻahu, Molokaʻi, Maui, and Hawaiʻi. (Unregulated streams are those for which peak flows are not altered to a large extent by upstream reservoirs, dams, diversions, or other structures.) The report describes (1) updated flood flows at selected streamgages for the 50-, 20-, 10-, 4-, 2-, 1-, 0.5-, and 0.2-percent AEPs using peak-flow data through water year 2020; (2) regional-skew estimates for Hawaiʻi; (3) regression equations for relating basin and climatic characteristics to flood flows at ungaged stream sites for the 50-, 20-, 10-, 4-, 2-, 1-, 0.5-, and 0.2-percent AEPs; and (4) the accuracy and limitations of the regression equations. The regression equations developed were incorporated in the web-based U.S. Geologcial Survey StreamStats application for Hawaiʻi.
