Location of 24 extensometers used to measure compaction in the Central Valley
Description
This digital dataset describes the location of 21 extensometers used for observations of subsidence in the
Central Valley Hydrologic Model (CVHM). The Central Valley encompasses an approximate 50,000 square-
kilometer region of California. The complex hydrologic system of the Central Valley is simulated using the
USGS numerical modeling code MODFLOW-FMP (Schmid and others, 2006). This simulation is referred
to here as the CVHM (Faunt, 2009). Utilizing MODFLOW-FMP, the CVHM simulates groundwater and
surface-water flow, irrigated agriculture, land subsidence, and other key processes in the Central Valley
]on a monthly basis from 1961-2003. The total active modeled area is 20,334 square-miles. Water levels,
water-level altitude changes, and water-level and potentiometric-surface altitude maps; streamflows;
boundary flows; subsidence; groundwater pumpage; water use; and water-delivery observations were
used to constrain parameter estimates throughout the calibration of the CVHM. Measured compaction
from data collected by extensometers in the valley was used as a subsidence calibration target.
Subsidence monitoring observations can provide valuable information about hydrologic parameters
such as elastic and inelastic skeletal specific storage. The CVHM was adjusted to fit the range of
measured compaction at the extensometer sites utilizing UCODE-2005 (Poeter and others, 2006)
and manual calibration. The calibration target was the measured compaction from several extensometers
in the region. Compaction though delayed drainage and re-pressurizing of aquitards was not simulated.
The CVHM is the most recent regional-scale model of the Central Valley developed by the U.S. Geological
Survey (USGS). The CVHM was developed as part of the USGS Groundwater Resources Program
(see "Foreword", Chapter A, page iii, for details).
Resources
| Name |
Format |
Description |
Link |
|
55 |
The metadata original format |
https://data.usgs.gov/datacatalog/metadata/USGS.869ae102-502b-49cc-9595-08d87ba74639.xml |
|
55 |
Landing page for access to the data |
https://doi.org/10.5066/P9DLANH8 |
Tags
- el-dorado-county
- glenn-county
- mendocino-county
- central-valley
- stanislaus-county
- usgs-869ae102-502b-49cc-9595-08d87ba74639
- sonoma-county
- groundwater
- lake-county
- cv-rasa
- san-joaquin-county
- shasta-county
- merced-county
- nevada-county
- kings-county
- kern-county
- colusa-county
- central-valley-hydrologic-model
- yolo-county
- sutter-county
- santa-barbara-county
- san-luis-obispo-county
- tuolumne-county
- sacramento-county
- subsidence
- calaveras-county
- solano-county
- mariposa-county
- tulare-county
- geoscientificinformation
- sacramento-valley
- placer-county
- monterey-county
- contra-costa-county
- groundwater-availability-of-the-central-valley-aquifer
- california
- texture-model
- madera-county
- inlandwaters
- model
- yuba-county
- hydrogeology
- ventura-county
- tehama-county
- extensometer
- butte-county
- trinity-county
- amador-county
- san-joaquin-valley
- san-benito-county
- humboldt-county
- hydrology
- napa-county
- central-valley-aquifer
- flow-model-cvhm
- alameda-county
- fresno-county
- santa-clara-county
- central-valley-california