U.S. Geological Survey (USGS)

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  • A hybrid machine learning model to predict and visualize nitrate concentration throughout the Central Valley aquifer, California, USA

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    A hybrid machine learning model to predict and visualize nitrate concentration throughout the Central Valley aquifer, California, USA

    Science of the Total Environment | June 9, 2017...
    Summary

    Intense demand forwater in the Central Valley of California and related increases in groundwater nitrate concentration threaten the sustainability of the groundwater resource....

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  • A study of methods to estimate debris flow velocity

    A study of methods to estimate debris flow velocity

    Landslides, Springer | September 16, 2019...
    Summary

    Debris flow velocities are commonly back-calculated from superelevation events which require subjective estimates of radii of curvature of bends in the debris flow...

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  • An Introduction to High-Frequency Nutrient and Biogeochemical Monitoring for the Sacramento– San Joaquin Delta, Northern California

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    An Introduction to High-Frequency Nutrient and Biogeochemical Monitoring for the Sacramento– San Joaquin Delta, Northern California

    U.S. Geological Survey (USGS), Delta Regional Monitoring Program | July 11, 2017...
    Summary

    This report is the first in a series of three reports that provide information about high-frequency (HF) nutrient and biogeochemical monitoring in the...

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  • Analysis and simulation of regional subsidence accompanying groundwater abstraction and compaction of susceptible aquifer systems in the USA

    Analysis and simulation of regional subsidence accompanying groundwater abstraction and compaction of susceptible aquifer systems in the USA

    Boletín de la Sociedad Geológica Mexicana | January 17, 2013...
    Summary

     Regional aquifer-system compaction and land subsidence accompanying groundwater abstraction in susceptible aquifer systems in the USA is a challenge for managing groundwater resources...

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  • Application of synthetic scenarios to address water resource concerns: A management-guided case study from the Upper Colorado River Basin

    Application of synthetic scenarios to address water resource concerns: A management-guided case study from the Upper Colorado River Basin

    Climate Services, Elsevier B.V. | December 9, 2017...
    Summary

    Water managers are increasingly interested in better understanding and planning for projected resource impacts from climate change. In this management-guided study, we use a...

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  • Bathymetry and Digital Elevation Models of Coyote Creek and Alviso Slough, South San Francisco Bay, California

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    Bathymetry and Digital Elevation Models of Coyote Creek and Alviso Slough, South San Francisco Bay, California

    U.S. Geological Survey (USGS) | March 15, 2018...
    Summary

    In 2010 the U.S. Geological Survey (USGS), Pacific Coastal and Marine Science Center completed three cruises to map the bathymetry of the main...

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  • Designing a High-Frequency Nutrient and Biogeochemical Monitoring Network for the Sacramento–San Joaquin Delta, Northern California

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    Designing a High-Frequency Nutrient and Biogeochemical Monitoring Network for the Sacramento–San Joaquin Delta, Northern California

    U.S. Geological Survey (USGS), Delta Regional Monitoring Program | July 11, 2017...
    Summary

    This report is the third in a series of three reports that provide information about how high-frequency (HF) nutrient monitoring may be used...

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  • Geohydrology, Geochemistry, and Ground-Water Simulation-Optimization of the Central and West Coast Basins, Los Angeles County, California By

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    Geohydrology, Geochemistry, and Ground-Water Simulation-Optimization of the Central and West Coast Basins, Los Angeles County, California By

    U.S. Geological Survey (USGS), Water Replenishment District of Southern California | January 3, 2003...
    Summary

    Historical ground-water development of the Central and West Coast Basins in Los Angeles County, California through the first half of the 20th century...

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  • Geology and Ground-Water Features of Shasta Valley, Siskiyou County California

    Geology and Ground-Water Features of Shasta Valley, Siskiyou County California

    U.S. Geological Survey (USGS), California Department of Water Resources (DWR) | January 15, 1959...
    Summary

    Shasta Valley is in the central part of Siskiyou County, Calif., and about 12 miles south of the Oregon border. It lies between the...

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  • Ground-Water-Level Monitoring and the Importance of Long-Term Water-Level Data

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    Ground-Water-Level Monitoring and the Importance of Long-Term Water-Level Data

    U.S. Geological Survey (USGS) | July 12, 2001...
    Summary

    Ground-water is among the Nation’s most precious natural resources. Measurements of water levels in wells provide the most fundamental indicator of the status...

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