Virginia Extensometer Network
Detailed Description
This static map shows the locations of the three existing extensometers (red) in the USGS' Virginia Extensometer Network with the location of a fourth future extensometer (green). The basemap is of the Virginia Coastal Plain and shows the severity of groundwater depletion, with darker blue indicating greater groundwater depletion.
Franklin extensometer
- Period of record: 1979-1995; 2016-present
- Depth: 866 ft. below land surface (bls)
- Location significance: proximal to pumping center
Suffolk extensometer
- Period of record: 1982-1995; 2016-present
- Depth: 1,599 ft. bls.
Nansemond extensometer
- Period of record: 2018-present
- Depth: 1,959 ft. bls.
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Location significance: proximity to SWIFT facility
Sources/Usage
Public Domain.
Adapted from Fig. 9 in Eggleston, Jack, and Pope, Jason, 2013, Land subsidence and relative sea-level rise in the southern Chesapeake Bay region: U.S. Geological Survey Circular 1392, 30 p., https://dx.doi.org/10.3133/cir1392.
Related
Land Subsidence on the Virginia Coastal Plain
Land subsidence is a loss of ground elevation, often experienced as the ground slowly sinking over the course of years. In eastern Virginia, high rates of groundwater use is a major factor in the land subsidence affecting the area. The Virginia-West Virginia Water Science Center, with the help of our partners, has been monitoring land subsidence in the Virginia Coastal Plain since 1979 using a...
Related
Land Subsidence on the Virginia Coastal Plain
Land subsidence is a loss of ground elevation, often experienced as the ground slowly sinking over the course of years. In eastern Virginia, high rates of groundwater use is a major factor in the land subsidence affecting the area. The Virginia-West Virginia Water Science Center, with the help of our partners, has been monitoring land subsidence in the Virginia Coastal Plain since 1979 using a...