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

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U.S. Department of the Interior KEN SALAZAR, Secretary U.S. Geological Survey Suzette M. Kimball, Acting Director U.S. Geological Survey, Reston, Virginia: 2009 For more information on the USGS—the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment, visit http://www.usgs.gov or call 1-888-ASK-USGS For an overview of USGS information products, including maps, imagery, and publications, visit http://www.usgs.gov/pubprod To order this and other USGS information products, visit http://store.usgs.gov Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this report is in the public domain, permission must be secured from the individual copyright owners to reproduce any copyrighted materials contained within this report. Suggested citation: Faunt, C.C., ed., 2009, Groundwater Availability of the Central Valley Aquifer, California: U.S. Geological Survey Professional Paper 1766, 225 p. ISBN 978-1-4113-2515-9
Foreword An adequate supply of groundwater is essential for the Nation’s health and economic well being. Increased use of groundwater resources and the effects of drought have led to concerns about the future availability of groundwater to meet domestic, agricultural, industrial, and environmental needs. The resulting effects of competition for groundwater from human and environmental uses need to be better understood to respond to the following basic questions that are being asked about the Nation’s ability to meet current and future demands for groundwater. Do we have enough groundwater to meet the needs of the Nation? Where are these groundwater resources? Is groundwater available where it is needed? To help answer these questions, the U.S. Geological Survey’s (USGS) Groundwater Resources Program is conducting large-scale multidisciplinary regional studies of groundwater availability, such as this study of the Central Valley Aquifer System, California. Regional groundwater availability studies quantify current groundwater resources, evaluate how those resources have changed through time, and provide tools that decision makers can use to forecast system responses to future development and climate variability and change. These quantitative studies are, by design, large in scope, can include multiple aquifers, and address critical groundwater issues. The USGS has previously identified the Nation’s principal aquifers and they will be used as a framework to classify and study regional groundwater systems. The groundwater availability studies being conducted for each regional groundwater flow system emphasize the use of long-term groundwater monitoring data, in conjunction with groundwater models, to improve understanding of the flow systems and assess the status and trends in groundwater resources in the context of a changing water budget for the aquifer system. The results of these individual groundwater availability studies will be used collectively as building blocks towards a national assessment of groundwater availability. In addition, these studies will provide the foundational information and modeling tools needed to help State and local resource managers make water availability decisions based on the latest comprehensive quantitative assessment given their regional water-management constraints and goals. Matthew C. Larsen, Associate Director for Water U.S. Geological Survey iii
Page 1 and 2: GROUNDWATER RESOURCES PROGRAM Groun
Page 3: Groundwater Availability of the Cen
Page 7 and 8: Contents Chapter A Introduction, Ov
Page 9 and 10: Chapter C Numerical Model of the Hy
Page 11 and 12: Figures Chapter A Figure A1. Map of
Page 13 and 14: Figure B12. Map of altitude of the
Page 15 and 16: Figure C28. Pie chart and histogram
Page 17 and 18: Conversion Factors Inch/Pound to SI
Page 19 and 20: Chapter A. Introduction, Overview o
Page 21 and 22: - - precipitation. -
Page 23 and 24: 40° 39° 38° 37° 36° 35° Klama
Page 25 and 26: Texture Model DATA Centralized Geos
Page 27 and 28: Hydrology Water Well Information Aq
Page 29 and 30: Table A1. Water-balance subregions
Page 31 and 32: B Red Bluff 0 50 100 Miles 0 50 100
Page 33 and 34: Delta and Eastside Streams ).
Page 35 and 36: for about 30 percent of the annual
Page 37 and 38: 0 50 100 Miles 0 50 100 Kilometers
Page 39 and 40: A Coast Ranges Clayey lenses Fault
Page 41 and 42: - the distribution of these pro
Page 43 and 44: C DEPTH TO MIDPOINT OF INCREMENT, I
Page 45 and 46: ). The southern part, referred , in
Page 47 and 48: 3-D Model of Percentage of Coarse-G
Page 49 and 50: A Layer 1 EXPLANATION Central Valle
Page 51 and 52: C Layer Corcoran Clay EXPLANATION C
Page 53 and 54: 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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References Cited 57 - - 2009, at
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60 Groundwater Availability of the
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Manuscript appproved on April 16, 2
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Central Valley Aquifer, Chapters A and B - MAE Class Websites

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