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The U.S. Geological Survey (USGS) recently completed a report documenting methods for peak-flow frequency analysis following implementation of the Bulletin 17C guidelines (https://doi.org/10.3133/tm4B5). The methods provide estimates of peak-flow quantiles for 50-, 20-, 10-, 4-, 2-, 1-, 0.5-, and 0.2-percent annual exceedance probabilities (AEPs) for selected streamgages operated by the USGS and Environment Canada. In association with the report, this data release presents peak-flow frequency analyses for 148 streamgages (127 stations in Maine, 16 in New Hampshire, and 5 in New Brunswick, Canada). Included are 148 individual ".PRT" text files that contain results of the flood-frequency analyses of annual peak flows...
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The Sparta aquifer is a primary source of groundwater in north-central Louisiana with more than 60 million gallons of water per day being withdrawn in 2015, and public supply and Industry account for over 90 percent of the water-use demand from the Sparta aquifer (Collier, 2018). Concentrated withdrawals from the Sparta aquifer have caused regional water-level declines within the Sparta aquifer (McGee and Brantly, 2015). Widespread concern about the potential effects of declining water levels has brought forth many questions regarding the sustainability of the aquifer as well as continued saltwater intrusion. In cooperation with the Louisiana Department of Transportation and Development, the U.S. Geological Survey...
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***Data release is currently under revision*** Ongoing point-count surveys of Mauna Kea volcano on Hawaii were used to estimate abundance of Palila from 1998-2018. This data release includes the point count data used to estimate abundance and a point-process shapefile summarizing observed counts in 2017-2018.


    map background search result map search result map Digitized Maps of the Potentiometric Surface of the Sparta Aquifer in North-Central Louisiana, 1886 to 2012 (version 1.1, April 2021) Mauna Kea Palila point count data from annual surveys 1998-2018 (Under Revision) Results of peak-flow frequency analysis and regionalization for selected streamgages in or near Maine, based on data through water year 2019 (ver. 2.0, March 2021) (COPY) Mauna Kea Palila point count data from annual surveys 1998-2018 (Under Revision) Results of peak-flow frequency analysis and regionalization for selected streamgages in or near Maine, based on data through water year 2019 (ver. 2.0, March 2021) (COPY) Digitized Maps of the Potentiometric Surface of the Sparta Aquifer in North-Central Louisiana, 1886 to 2012 (version 1.1, April 2021)