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Projected responses of the coastal water table for California using present-day and future sea-level rise scenarios


Publication Date


Befus, K.M., Hoover, D.J., Barnard, P.L., and Erikson, L.H., 2020, Projected responses of the coastal water table for California using present-day and future sea-level rise scenarios: U.S. Geological Survey data release,


Coastal groundwater levels (heads) can increase with sea level rise (SLR) where shallow groundwater floats on underlying seawater. In some areas coastal groundwater could rise almost as much as SLR, but where rising groundwater intersects surface drainage features, the increase will be less. Numerical modeling can provide insight into coastal areas that may be more or less vulnerable to hazards associated with SLR-driven groundwater shoaling (moving closer to the ground surface) and emergence (flooding the ground surface), providing coastal planners with critical information that can be used to increase public safety, mitigate physical damages, and more effectively manage and allocate resources in complex coastal settings. Seamless [...]

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“Groundwater model methods”
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“Map of groundwater modeling coverage”
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These data are intended for policy makers, resource managers, science researchers, students, and the general public. These data can be used with geographic information systems or other software to identify and assess possible areas of vulnerability. These data are not intended to be used for navigation. This work is part of on-going CoSMoS modeling efforts for California and the western United States. For more information on CoSMoS implementation, see


Inundated or affected areas shown should not be used for navigation, regulatory, permitting, or other legal purposes. The U.S. Geological Survey provides these data as is for a quick reference, emergency planning tool but assumes no legal liability or responsibility resulting from the use of this information. The suggestions and illustrations included in these data are intended to improve coastal-flood awareness and preparedness; however, they do not guarantee the safety of an individual or structure. The contributors and sponsors of this product do not assume liability for any injury, death, property damage, or other effects of coastal flooding.
Map of groundwater modeling coverage
Map of groundwater modeling coverage


  • Coastal Storm Modeling System (CoSMoS)
  • Pacific Coastal and Marine Science Center
  • USGS Data Release Products




Data source
Input directly

Additional Information


Type Scheme Key
DOI doi:10.5066/P9H5PBXP

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