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

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.

美国地质调查局（U.S. Geological Survey, USGS）与夏威夷州交通运输部合作，基于截至2020水文年的观测数据，对夏威夷州考艾岛、瓦胡岛、莫洛凯岛、毛伊岛及夏威夷岛的无调控水文站，估算了50%、20%、10%、4%、2%、1%、0.5%及0.2%年超越概率（annual exceedance probability, AEP）对应的洪水量级。研究开发了可用于估算无监测河段洪水量级及对应重现期的回归方程，本研究的方法与成果已发表于独立报告（https://doi.org/10.3133/sir20235014）。

本次数据发布包含支撑该整体研究的四类数据：(1) 夏威夷州238个选定水文站的PeakFQ输入文件及精选输出结果；(2) 用于构建区域回归方程的USGS加权多元线性回归（weighted-multiple-linear regression, WREG）程序的输入与输出文件；(3) 支撑报告的地理空间数据，涵盖流域边界划分、流域特征参数及区域回归边界；(4) 整体研究的精选附录。

此类数据可用于复现该整体研究的成果——《基于截至2020水文年的观测数据：夏威夷州考艾岛、瓦胡岛、莫洛凯岛、毛伊岛及夏威夷岛的洪水量级与频率》。