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projected water table depths
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596036
shapefiles of projected water table depths for the California County, marine boundary condition (MHHW or LMSL), SLR, and Kh case specified, including "linear" head response (no removal of groundwater reaching the ground surface) for each scenario
originators at United States Geological Survey, Pacific Coastal and Marine Science Center
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0 = water table at or above ground surface (emergent groundwater)
1 = water table between 0-1 m depth (very shallow)
2 = 1-2 m depth (shallow)
5 = 2-5 m depth (moderate)
6 = > 5 m depth (deep)
producer defined
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source website, information and the ability to download content found here.
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dataset
PCMSC Science Data Coordinator
U.S. Geological Survey, Pacific Coastal and Marine Science Center
831-460-4747
pcmsc_data@usgs.gov
20220119
ArcGIS Metadata
1.0
Enterprise Geodatabase Feature Class
CoSMoS projected groundwater emergence (low risk) SLR 1.25 meters
Projected groundwater emergence and shoaling for coastal California using present-day and future sea-level rise scenarios
2020-08-11
PCMSC Science Data Coordinator
U.S. Geological Survey, Pacific Coastal and Marine Science Center
831-460-4747
pcmsc_data@usgs.gov
U.S. Geological Survey
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Groundwater emergence and shoaling extents are derived from water table GeoTIFFs, which are calculated as steady-state groundwater model heads subtracted from high-resolution topographic Digital Elevation Model (DEM) land surface elevations. Results are provided as shapefiles of water table depth in specific depth ranges, with the following data coding in the "fbin_m" data column:-1 = marine inundation (below marine boundary condition (LMSL or MHHW) sea level)0 = water table at or above ground surface (emergent groundwater)1 = water table between 0-1 m depth (very shallow)2 = 1-2 m depth (shallow)5 = 2-5 m depth (moderate)6 = &amp;gt; 5 m depth (deep)Model results are aggregated by County, with separate County files for model results using the Local Mean Sea Level (LMSL) and Mean Higher-High Water (MHHW) marine boundary conditions. Each zipped County datafile (County_MHHW or County_LMSL) contains 6 folders: 3 containing full model results for each of the three horizontal hydraulic conductivities (Kh) used in the model (0.1, 1.0 and 10 m/d), and 3 containing "linear" results for each of the 3 Kh's, where sea level rise is added directly to the full model present-day (SLR 0m) water table. Each full model Kh folder contains depth-to-groundwater shapefiles for all twelve of the sea level rise scenarios (0 - 2m in 0.25m increments, 2.5m, 3m, and 5m), while linear Kh folders contain depth-to-groundwater shapefiles only for the 11 non-zero SLR cases, because the linear SLR 0m case is identical to the full model SLR 0m case.</SPAN></P></DIV></DIV></DIV>
Projections for future sea-level rise provide emergency responders and coastal planners with critical hazards information that can be used to increase public safety, mitigate physical damages, and more effectively manage and allocate resources within complex coastal settings. 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 one portion of ongoing CoSMoS modeling efforts for California and the western United States. For information on CoSMoS data sources and details on methodology, see https://www.sciencebase.gov/catalog/file/get/5633fea2e4b048076347f1cf?name=CoSMoS_SoCalv3_Phase2_summary_of_methods.pdf. For more information on CoSMoS, see https://www.usgs.gov/centers/pcmsc/science/coastal-storm-modeling-system-cosmos
U.S. Geological Survey; 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, https://doi.org/10.5066/P9H5PBXP.
sea level rise, groundwater flow, floods, climate change
sea level rise
groundwater flow
floods
climate change
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey and the University of Wyoming as the originators of the dataset and in products derived from these data. This information is not intended for navigation purposes.</SPAN></P></DIV></DIV></DIV>
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.
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Using water table depth raster data, a polygon shapefile was created for water table depths in specific depth ranges (emergent, 0-1m, 1-2m, 2-5m, >5m). See Groundwater_emergence_and_shoaling_methods.pdf, available with this data release, for additional information.
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