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For more information on the USGS-the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment-visit http://www.usgs.gov or call 1-888-ASK-USGS.For an overview of USGS information products, including maps, imagery, and publications, visit http://store.usgs.gov.Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner. , and Glenn Agunat (Monsanto Company) for their help with gaining access to the study area. Michele Harman (HBWS) also supplied critical water-level data for the duration of the study from a groundwater-monitoring well in the study area. This study could not have been completed without the assistance of Rick Fontaine, Alan Mair, Chris Cummings, and Chiu Yeung. Finally, the author would like to thank Delwyn Oki for his support and guidance in project design and report preparation. State Well NumbersSince 1971, Hawaiʻi's well-numbering system has contained seven digits. The first digit distinguishes the island, which is then followed by a dash separator. The next four digits represent the grid system, with the first two digits representing minutes of latitude and the second two digits representing minutes of longitude for that grid (using leading zeroes for minute values less than 10). To distinguish wells within a minute grid, two digits were added following the 4-digit minutegrid numbers with a dash separator, and are sometimes referred to as a sequence number.In 2012, Hawaiʻi's well-numbering system was modified to accommodate more wells than the previous numbering system would allow. The sequence number was changed from two digits to three digits, allowing for a grid to have 100 or more wells. If the sequence number is less than 100, the new numbering system places a zero in front of the 2 digits. References to wells in this report will only use a two-digit sequence number when the sequence number is less than 100.

For an overview of USGS information products, including maps, imagery, and publications, visit https://store.usgs.gov.Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner.

eliable estimates of the magnitude and frequency of floods are necessary for the safe and efficient design of roads, bridges, waterconveyance structures, and flood-control projects and for the management of flood plains and floodprone areas. StreamStats provides a simple, fast, and reproducible method to define drainage-basin characteristics and estimate the frequency and magnitude of peak discharges in Hawaii's streams using recently developed regional regression equations (Oki and others, 2010). StreamStats allows the user to estimate the magnitude of floods for streams where data from stream-gaging stations do not exist. Existing estimates of the magnitude and frequency of peak discharges in Hawaii can be improved with continued operation of existing stream-gaging stations and installation of additional gaging stations for areas where limited stream-gaging data are available.

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