California Department of Water Resources

The Department of Water Resources (DWR) is responsible for managing and protecting California’s water resources. DWR works with other agencies to benefit the State’s people and to protect, restore and enhance the natural and human environments.

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WDL Ground Surface Displacement - Land Subsidence Monitoring

Borehole extensometers are a more site specific method of measuring land subsidence. These instruments consist of a pipe or cable anchored at the bottom of a well casing. Pipe or cable extend from the bottom of the well, through geologic layers susceptible to compaction, to the ground surface. The pipe or cable is connected to a recorder that measures the relative distance between the bottom of the bore hole to the ground surface. These instruments are capable of detecting changes in land surface elevation to 1/100th of a foot. When land subsidence and water depth monitoring activities are paired together, hydraulic and mechanical properties of the aquifer system can be determined. DWR monitors 11 extensometers in the Sacramento Valley.

For more information regarding land subsidence monitoring vist: http://www.water.ca.gov/groundwater/landsubsidence/LSmonitoring.cfm

Source: CNRA - DWR
FieldValue
Publisher
Modified
2019-06-14T19:05:09.885555
Release Date
2019-06-14
Identifier
6fc2f546-2a84-401f-ac5e-59bbd42da793
Language
English
Contact Name
Water Data Library
Contact Email
Public Access Level
Public
POD Theme
Water
Harvested from CNRA - DWR
Harvest Source TitleCNRA - DWR
Harvest Source URIhttps://data.cnra.ca.gov/organization/dwr/data.json
Last Harvest PerformedFri, 07/19/2019 - 06:31