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

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86 Groundwater Availability of the <strong>Central</strong> <strong>Valley</strong> <strong>Aquifer</strong>, California<br />

A<br />

700<br />

500<br />

400<br />

320<br />

360<br />

280<br />

120<br />

240<br />

120<br />

160<br />

0<br />

0 50 100 Miles<br />

80<br />

200<br />

40<br />

0 50 100 Kilometers<br />

Shaded relief derived from U.S. Geological Survey<br />

National Elevation Dataset, 2006. Albers Equal Area Conic Projection<br />

40<br />

120<br />

0<br />

160<br />

40<br />

120<br />

120<br />

120<br />

120<br />

80<br />

240<br />

120<br />

80<br />

200<br />

240<br />

160<br />

200<br />

120<br />

500<br />

600<br />

200<br />

320<br />

200<br />

280<br />

400<br />

EXPLANATION<br />

Spring 1961<br />

Water-level altitude<br />

(from Williamson <strong>and</strong> others, 1989),<br />

in feet above NGVD 29—<br />

240<br />

360<br />

280<br />

400<br />

320<br />

320<br />

160<br />

360<br />

280<br />

320<br />

280<br />

0<br />

1 to 50<br />

51 to 100<br />

101 to 200<br />

201 to 400<br />

401 to 800<br />

<strong>Central</strong> <strong>Valley</strong> boundary<br />

Major streams <strong>and</strong> canals<br />

Direction of flow<br />

Figure B12. Altitude of the A, Water table in the unconfined part of the aquifer system (Williamson <strong>and</strong> others, 1989). B, Potentiometric surface of the confined<br />

part of the aquifer system for 1961 (Williamson <strong>and</strong> others, 1989). C, Unconfined part of the aquifer system (Williamson <strong>and</strong> others, 1989). D, Potentiometric<br />

surface of the confined part of the aquifer system for 1976 (Williamson <strong>and</strong> others, 1989. E, Unconfined part of the aquifer system (simulated, ).<br />

F, Potentiometric surface of the confined part of the aquifer system, for 2000 (simulated, ).<br />

400<br />

240<br />

360<br />

360<br />

400<br />

320<br />

500

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