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    Tritium as a tracer of groundwater sources and movement in the Safford Basin, Graham County, Arizona

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    Author
    Harris, R.C.
    Issue Date
    2000-09-01
    Keywords
    Arizona Geological Survey Open File Reports
    Gila River
    Arizona
    Graham County
    Safford Basin
    Geology
    hydrology
    groundwater quality
    evaporites
    dating
    Tritium
    geochronology
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    Citation
    Harris, R.C., 2000, Tritium as a tracer of groundwater sources and movement in the Safford Basin, Graham County, Arizona. Arizona Geological Survey Open File Report, OFR-00-09, 56 p.
    Description
    The Arizona Geological Survey (AZGS) performed a study to measure the tritium content of waters form various sources in the Safford Basin, part the upper Gila River watershed. The concentration of the naturally occurring radioactive isotope of hydrogen, known as tritium, was measured to determine the "age" of groundwater from different sources. The project area is shown on Figure 1. Water balance calculations and aquifer tests suggest upwelling of groundwater from the deep basin-fIll aquifer into the shallow alluvial aquifer of the Gila floodplain (Hanson and Brown, 1972; Brown, 1989). Based on the widespread occurrence of evaporites in the Safford basin fill (Harris, 1997) and the isotopic compositions of evaporites, deep well water, and river water (Harris, 1999a), natural water sources such as artesian leakage and springs may be an important source ofTDS in the Gila River. If this is the case, attempts to mitigate water quality problems in the Gila River by focusing on specific human activities, such as agriculture, may be misdirected. The purpose of the pilot study is to assess the utility of the tritium technique as applied to determining the degree of mixing between "old", deep groundwater in contact with highly soluble salts in the basin-fill sediments, and "young", shallow groundwater that constitutes a mixture of subflow from tributaries, infiltration of Gila River water, and possible infiltration of irrigation water. This study will help water management agencies make informed decisions regarding issues of water quality in the Gila River and how to apply appropriate mitigation measures regarding salinity. (56 pages)
    URI
    http://hdl.handle.net/10150/630026
    Additional Links
    https://library.azgs.arizona.edu/
    Language
    en
    Series/Report no.
    OFR-00-09
    Rights
    Arizona Geological Survey. All rights reserved.
    Collection Information
    Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu.
    North Bounding Coordinate
    33.2479
    South Bounding Coordinate
    32.4356
    West Bounding Coordinate
    -109.962
    East Bounding Coordinate
    -109.083
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