U.S. Geological Survey (USGS)

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  • A Guide for Using the Transient Ground-Water Flow Model of the Death Valley Regional Ground-Water Flow System, Nevada and California

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    A Guide for Using the Transient Ground-Water Flow Model of the Death Valley Regional Ground-Water Flow System, Nevada and California

    U.S. Geological Survey, U.S. Department of Energy Office of Environmental Management | November 4, 2006...
    Summary

    This report is a guide for executing numerical simulations with the transient ground-water flow model of the Death Valley regional ground-water flow system,...

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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 Simulation-Optimization Model for Water-Resources Management, Santa Barbara, California

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    A Simulation-Optimization Model for Water-Resources Management, Santa Barbara, California

    Journal of Water Resources Planning and Management, U.S. Geological Survey | September 1, 1998...
    Summary

    A simulation-optimization model has been developed for the optimal management of the city of Santa Barbara's water resources during a drought. The model,...

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  • A Water Resources Data Network Evaluation for Monterey County, California; Phase 1; South County

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    A Water Resources Data Network Evaluation for Monterey County, California; Phase 1; South County

    U..S. Geological Survey, Monterey County Flood Control and Water Conservation District | July 12, 1986...
    Summary

    An evaluation made of rainfall, surface water, groundwater, and water quality monitoring networks in Salinas River basin in southern Monterey County, California, proposed...

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  • A Water Resources Data Network Evaluation for Monterey County, California; Phase 3, Northern Salinas River Drainage Basin

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    A Water Resources Data Network Evaluation for Monterey County, California; Phase 3, Northern Salinas River Drainage Basin

    U.S. Geological Survey, Monterey County Flood Control and Water Conservation District | December 13, 1990...
    Summary

    Continuing data collection and analysis are vital to efficient development and management of water resources. To insure that water managers have adequate information...

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  • A Water Resources Data-Network Evaluation for Monterey County, California, Phase 3: Northern Salinas River Drainage Basin

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    A Water Resources Data-Network Evaluation for Monterey County, California, Phase 3: Northern Salinas River Drainage Basin

    U.S. Geological Survey, Monterey County Flood Control and Water Conservation District | December 15, 1990...
    Summary

    This report presents an evaluation of water resources data collection networks in the northern Salinas River drainage basin, Monterey County, California. The evaluation,...

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  • Age Determination of the Remaining Peat in the Sacramento–San Joaquin Delta, California, USA

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    Age Determination of the Remaining Peat in the Sacramento–San Joaquin Delta, California, USA

    U.S. Geological Survey (USGS) | October 9, 2007...
    Summary

    The Sacramento–San Joaquin Delta of California was once a 1,400 square kilometer (km2) tidal marsh, which contained a vast layer of peat ranging...

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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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  • California Groundwater Units

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    California Groundwater Units

    U.S. Geological Survey (USGS) | June 5, 2014...
    Summary

    The California Groundwater Units dataset classifies and delineates areas within the State of California into one of three groundwater-based polygon units: (1) those...

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  • Data from a Thick Unsaturated Zone Underlying Oro Grande and Sheep Creek Washes in the Western Part of the Mojave Desert, near Victorville, San Bernardino County, California

    Data from a Thick Unsaturated Zone Underlying Oro Grande and Sheep Creek Washes in the Western Part of the Mojave Desert, near Victorville, San Bernardino County, California

    U.S. Geological Survey | January 1, 2000...
    Summary

    This report presents data collected as part of a cooperative study of infiltration and groundwater recharge to the regional aquifer near Victorville, California....

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  • Delta Subsidence in California: The sinking heart of the State

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    Delta Subsidence in California: The sinking heart of the State

    U.S. Geological Survey (USGS) | April 8, 2000...
    Summary

    The Sacramento-San Joaquin River Delta of California once was a great tidal freshwater marsh blanketed by peat and peaty alluvium. Beginning in the...

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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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  • Detections of current-use pesticides at 12 surface water sites in California during a 2-year period beginning in 2015

    Detections of current-use pesticides at 12 surface water sites in California during a 2-year period beginning in 2015

    U.S. Geological Survey (USGS), Central Valley Regional Water Quality Control Board | July 27, 2018...
    Summary

    Surface water samples were collected by the U.S. Geological Survey and multiple cooperators during base flow/irrigation runoff and storm runoff conditions from 12...

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  • Effects of Groundwater Pumping on Agricultural Drains in the Tule Lake Subbasin, Oregon and California

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    Effects of Groundwater Pumping on Agricultural Drains in the Tule Lake Subbasin, Oregon and California

    U.S. Geological Survey, U.S. Fish and Wildlife Service, U.S. Bureau of Reclamation | July 24, 2015...
    Summary

    Since 2001, irrigators in the upper Klamath Basin have increasingly turned to groundwater to compensate for reductions in surface-water allocation caused by shifts...

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  • Estimating Exposure of Piscivorous Birds and Sport Fish to Mercury in California Lakes Using Prey Fish Monitoring—A Predictive Tool for Managers

    Estimating Exposure of Piscivorous Birds and Sport Fish to Mercury in California Lakes Using Prey Fish Monitoring—A Predictive Tool for Managers

    U.S. Geological Survey (USGS) | May 22, 2015...
    Summary

    Numerous water bodies in California are listed under the Clean Water Act as being impaired due to mercury (Hg) contamination. The Surface Water...

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  • Evaluation of a Ground-Water Flow and Transport Model of the Upper Coachella Valley, California

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    Evaluation of a Ground-Water Flow and Transport Model of the Upper Coachella Valley, California

    U.S. Geological Survey; California Regional Water Quality Control Board, Colorado River Basin Region | June 25, 1992...
    Summary

    A geohydrologic data base was compiled to evaluate the changes in ground-water conditions in the upper Coachella Valley, California, since 1978, when the...

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  • Evaluation of Geohydrologic Framework, Recharge Estimates, and Ground-Water Flow of the Joshua Tree Area, San Bernardino County, California

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    Evaluation of Geohydrologic Framework, Recharge Estimates, and Ground-Water Flow of the Joshua Tree Area, San Bernardino County, California

    U.S. Geological Survey, Joshua Basin Water District | February 7, 2005...
    Summary

    Ground water historically has been the sole source of water supply for the community of Joshua Tree in the Joshua Tree ground-water subbasin...

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  • Evaluation of Processes Affecting 1,2-Dibromo-3-Chloropropane (DBCP) Concentrations in Ground Water in the Eastern San Joaquin Valley, California: Analysis of Chemical Data and Ground-Water Flow and Transport Simulations

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    Evaluation of Processes Affecting 1,2-Dibromo-3-Chloropropane (DBCP) Concentrations in Ground Water in the Eastern San Joaquin Valley, California: Analysis of Chemical Data and Ground-Water Flow and Transport Simulations

    U.S. Geological Survey, University of California - Davis | December 17, 1999...
    Summary

    Future use of the sole-source aquifer near Fresno in the eastern San Joaquin Valley, California, will depend, in part, on how long 1,2-dibromo-3-chloropropane...

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  • Evaluation of Surface-Water/Ground-Water Interactions in the Santa Clara River Valley, Ventura County, California

    Evaluation of Surface-Water/Ground-Water Interactions in the Santa Clara River Valley, Ventura County, California

    U.S. Geological Survey (USGS), United Water Conservation District | May 28, 1999...
    Summary

    The interactions of surface water and ground water along the Santa Clara River in Ventura County, California, were evaluated by analyzing river-discharge and water-quality data and geohydrologic...

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  • Evaluation of the Source and Transport of High Nitrate Concentrations in Ground Water, Warren Subbasin, California

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    Evaluation of the Source and Transport of High Nitrate Concentrations in Ground Water, Warren Subbasin, California

    U.S. Geological Survey, Hi-Desert Water Agency, Mojave Water Agency | December 13, 2003...
    Summary

    From early 1995 through 2001, nitrate (NO3) concentrations in ground water in the Warren subbasin, California, increased from a background concentration of 10...

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