Groundwater
Groundwater
Filter Total Items: 80
Water Availability of the Salton Sea Watershed
Throughout history, the Salton Sea has formed and dried up due to flooding from the Colorado River. It was most recently formed in 1905 when the Colorado River broke through an irrigation canal and flowed uncontrolled into the Salton Sea watershed. The Salton Sea is a terminal lake (it has no outlets). It is also a transboundary watershed, with area in both the state of California and Mexico’s...
Drought in California
The USGS closely monitors the occurence and effects of drought through data collection and research. USGS science supports water managers in preparing for possible future drought by providing information about long-term hydrologic, climatic, and environmental changes. These studies support successful planning and science-based decision-making by water managers who must address complex issues and...
Results of Hexavalent Chromium Background Study in Hinkley, California
John Izbicki, PhD, a Research Hydrologist with the U.S. Geological Survey (USGS) California Water Science Center (CAWSC), led a five-year scientific study to determine the range of natural and anthropogenic (human-caused) hexavalent chromium concentrations, also referred to as chromium-6 or Cr(VI), in Hinkley Valley. The study was cooperatively funded by the Lahontan Regional Water Quality Control...
Salinas Valley Operational Model: Interlake Tunnel and San Antonio Spillway Modification Project
An operational model for Salinas Valley is needed to evaluate and compare ecosystem, conservation, and water demands. This model must simulate current operations, assess benefits of and evaluate scenarios for tunnel operation and potential reservoir and spillway modifications.
Forecasting Total Dissolved Solids Concentrations of Groundwater from the Lower Colorado Water Supply Project
The USGS seeks to increase understanding of the groundwater system in the vicinity of the Lower Colorado Water Supply Project well field and to estimate future groundwater levels and total dissolved solids concentrations in the wells and the long-term viability of the Lower Colorado Water Supply Project.
Los Angeles Coastal Plain Groundwater-flow Model
The Los Angeles Coastal Plain Groundwater-flow Model (LACPGM) is a tool to help water managers better understand groundwater flow and seawater intrusion in the Los Angeles coastal plain basins. It is the culmination of years of data collection and studies in the area and builds on our understanding of the area’s geology and hydrology obtained through the geologic and groundwater flow models.
Investigation of Groundwater and Surface Water Interactions in Support of Ecosystem Management at San Sebastian Marsh, California
To help the U.S. Bureau of Land Management determine the long-term sustainability of the San Sebastian Marsh, and its critical role for the survival of the endangered desert pupfish ( Cyprinodon macularius ), the USGS is evaluating the potential interactions and relation between groundwater and surface water at the San Sebastian Marsh.
Evaluation of Groundwater Resources in the Adelaida Area of San Luis Obispo County, California
Stakeholders in San Luis Obispo County are concerned that the increased demand for water use has, and will continue to, affect groundwater levels and availability in the Adelaida area. To address stakeholder concerns, the County of San Luis Obispo Board of Supervisors has asked the USGS to conduct a comprehensive evaluation of groundwater resources of the Adelaida area.
MODFLOW One-Water Hydrologic Flow Model—Conjunctive Use Simulation Software (MF-OWHM)
The MODFLOW One-Water Hydrologic Flow Model (MF-OWHM) – Conjunctive Use Simulation Software (Boyce, 2022; Boyce and others, 2020; Hanson and others, 2014) builds upon the MODFLOW-2005 framework for the simulation and analyses of conjunctive-use, water-management, and climate-crop-water scenario problems.
Evaluation of groundwater resources of the Anza-Terwilliger area, Anza, California
Groundwater is the sole source for water use to the rural community and two Native American tribes in the Cahuilla Valley and Terwilliger Valley groundwater basins, which are located approximately 35 miles southwest of Palm Springs, California. The characteristics and sustainable yield of the basins are not well understood and are threatened by increasing water use and potential changes in water...
San Diego Hydrogeology
This is the first comprehensive geologic and hydrologic study for the San Diego area. This study will provide the integrated hydrogeologic knowledge necessary in this important and highly visible area of the United States and will serve as a role model for similar coastal settings throughout the world that have modest rainfall and small aquifers. Locally, results will help state and federal...
Groundwater Ambient Monitoring & Assessment (GAMA)
The Groundwater Ambient Monitoring and Assessment Program’s Priority Basin Project (GAMA-PBP) was established by the California State Water Resources Control Board (SWRCB) in response to the Ground-Water Quality Monitoring Act of 2001 (Sections 10780-10782.3 of the California Water Code). The USGS is the technical lead for the GAMA-PBP and between 2004-2012 focused on characterizing the quality of...