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

Organization

California Department of Water Resources

DWR manages California's water resources, systems, and infrastructure, including the State Water Project (SWP), in a responsible, sustainable way.

Additional Info

Field	Value
Homepage URL	http://wdl.water.ca.gov/waterdatalibrary/
Contact Name	Water Data Library
Contact Email	[email protected]
Frequency	Irregular
Public Access Level	Public
Limitations	DWR makes no warranties or guarantees - either expressed or implied - as to the completeness, accuracy, or correctness of the data. DWR neither accepts nor assumes liability arising from or for any incorrect, incomplete, or misleading subject data.
Language	English
Spatial Coverage
Last Updated	April 28, 2024, 16:06 (UTC)

WDL Ground Surface Displacement - Land Subsidence Monitoring

Data and Resources

Additional Info