Central Valley Aquifer, Chapters A and B - MAE Class Websites

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108 Groundwater Availability of the Central Valley Aquifer, California - habitat. - subsidence. ) and the suitable. Other factors that need to be considered include local - compaction in these units. Other Management Strategies - - - ability to monitor soil moisture and other crop-related data ence that has already occurred, additional subsidence can be aquifer system compact inelastically and the land subsidence becomes permanent (- - - identify areas that most likely are susceptible to subsidence others, 1999).
When long-term pumping lowers ground water levels and stresses on the aquitards beyond the preconsolidationstress thresholds, the aquitards compact and the land surface subsides permanently. CH 1 Critical head at time, t 1 CH 2 Critical head at time, t 2 h 1 h 2 h t2 greater than t 1 Head in well at t1 Head in well at t2 b Total land subsidence, which equals compressibility times h Difference in head, (h2 minus h1) Water table Monitoring the Hydrologic System h - - - t 1 Land surface Clay and silt (aquitards) Granular aquitard skeleton defining fluid-filled pore spaces storing groundwater h 1 CH 1 Land surface b h2=CH2 Rearranged, compacted granular aquitard skeleton with reduced porosity and groundwater storage capacity Monitoring the Hydrologic System 109 Depth to water When h 1 is greater than CH 1 , sediments are overconsolidated with compression, and land subsidence is predominately elastic and recoverable When h 2 is equal to CH 2 , sediments are normally consolidated with additional head decline causing inelastic and nonrecoverable land subsidence Compaction of the aquifer system is concentrated in the aquitards Figure B18. Relationship of water-level changes and critical heads to subsidence and inelastic compaction. t 2 Time Long-term decline in water level modulated by the seasonal cycles of groundwater pumping -
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GROUNDWATER RESOURCES PROGRAM Groun
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Groundwater Availability of the Cen
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Foreword An adequate supply of grou
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Contents Chapter A Introduction, Ov
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Chapter C Numerical Model of the Hy
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Figures Chapter A Figure A1. Map of
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Figure B12. Map of altitude of the
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Figure C28. Pie chart and histogram
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Conversion Factors Inch/Pound to SI
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Chapter A. Introduction, Overview o
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- - precipitation. -
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40° 39° 38° 37° 36° 35° Klama
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Texture Model DATA Centralized Geos
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Hydrology Water Well Information Aq
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Table A1. Water-balance subregions
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B Red Bluff 0 50 100 Miles 0 50 100
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Delta and Eastside Streams ).
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for about 30 percent of the annual
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0 50 100 Miles 0 50 100 Kilometers
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A Coast Ranges Clayey lenses Fault
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- the distribution of these pro
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C DEPTH TO MIDPOINT OF INCREMENT, I
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). The southern part, referred , in
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3-D Model of Percentage of Coarse-G
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A Layer 1 EXPLANATION Central Valle
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C Layer Corcoran Clay EXPLANATION C
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E Layer 9 EXPLANATION Central Valle
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Geomorphic province— Basin Delta
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San Joaquin Valley ),
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- Water supplied from aquifers
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C Figure A16. Continued. 3.54% 5.45
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CUMULATIVE DEPARTURE OF PRECIPITATI
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CUMULATIVE DEPARTURE OF STREAMFLOW
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700 500 600 400 200 160 0 50 100 Mi
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B 0 50 100 Miles 0 50 100 Kilometer
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Water Budget per year (
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References Cited 55 -
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158 Groundwater Availability of the
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Manuscript appproved on April 16, 2
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