Hawaii StreamStats
StreamStats for Hawaii was developed in cooperation with the State of Hawaii Department of Transportation.
StreamStats is implemented for the islands of Kauai, Oahu, Molokai, Maui, and Hawaii, State of Hawaii. The StreamStats for Hawaii application provides peak-flow statistics with annual exceedance probabilities of 50, 20, 10, 4, 2, 1, and 0.2 percent. These peak flows have recurrence intervals of 2-, 5-, 10-, 25-, 50-, 100-, and 500-year floods. The report below presents the equations used to estimate the flow statistics, documents the errors associated with the estimates, and describes the methods used to develop the equations and to measure the basin characteristics used in the equations. Users should familiarize themselves with this report before using StreamStats to obtain estimates of streamflow statistics for ungaged sites.
A Fact Sheet specific to the Hawaii StreamStats application is also available as a resource:
The geospatial data sets used in the Hawaii StreamStats application are published and available for download. See the following data release for more information:
Click on this link to obtain general information on the Hawaii application, as well as specific sources and computation methods for basin characteristics.
NOTE: On May 5, 2023, the U.S. Geological Survey published a report describing regression equations used for estimating flood magnitude and frequency for gaged and ungaged streams in Hawaiʻi (Mitchell and others, 2023). The regression equations published in this report are an update to the previous regression equations published in 2010 (Oki and others, 2010). After the publication of the report containing the new regression equations, however, the updated data and regressions were not successfully uploaded to the online StreamStats application. Instead, the drainage-basin delineations, basin characteristics, regression equations for ungaged streams, and pre-computed flow statistics for gaged streams available on the StreamStats application remained the same as those released in 2010. This issue would have affected both the point-and-click application of StreamStats and the batch processor.
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