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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is a primary source of groundwater in north-central Louisiana with more than 60 million gallons of water per day being withdrawn in 2015, and public supply and Industry account for over 90 percent of the water-use demand from the Sparta aquifer (Collier, 2018).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...
Note: Data release is currently under revision Understanding water use needed for irrigation is central to water-resource planning and public decision making. Meeting this basic need requires accurate estimates of water withdrawals for irrigated lands and an understanding of how factors driving water-use needs are likely to change in the future. In order to assist local decision makers in Tennessee, the U.S. Geological Survey (USGS), in cooperation with the Tennessee Department of Environment and Conservation, Division of Water Resources (TDEC–DWR), evaluated past water-use and irrigation data to understand the effect of irrigation on groundwater resources in select counties in Tennessee. The irrigation data for...
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The data contained in this data release support USGS Scientific Investigations Report 2020-5023, "Distribution of selected hydrogeologic characteristics of the upper glacial and Magothy aquifers, Long Island, New York" (Walter and Finkelstein, 2020). This data release contains estimates of aquifer texture describing the Long Island aquifer system. These estimates in total can be considered a model of aquifer texture describing unconsolidated sediments in the following principal units: 1) Upper glacial aquifer, 2) Jameco aquifer, 3) Monmouth Greensand confining unit, and 4) Magothy aquifer. The Lloyd aquifer, a major aquifer on Long Island, is not included in the model due to a lack of available data. Aquifer texture...
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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, November 2020) Aquifer texture data describing the Long Island aquifer system Mauna Kea Palila point count data from annual surveys 1998-2018 (Under Revision) Irrigated acreage in Tennessee Counties, 1934 to 2012 (Under revision) Mauna Kea Palila point count data from annual surveys 1998-2018 (Under Revision) Aquifer texture data describing the Long Island aquifer system Irrigated acreage in Tennessee Counties, 1934 to 2012 (Under revision) Digitized Maps of the Potentiometric Surface of the Sparta Aquifer in North-Central Louisiana, 1886 to 2012 (version 1.1, November 2020)