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

42 Groundwater Availability of the Central Valley Aquifer, California
A
FLOW RATE, IN THOUSANDS OF ACRE-FEET PER YEAR
B
MEAN PRECIPITATION, IN INCHES PER YEAR
80,000
70,000
60,000
50,000
40,000
30,000
20,000
10,000
0
30
25
20
15
10
5
0
"Normal"
to
Dry
"Normal"
to
Dry
Representative Water Year
"Variable"
to
Wet
"Variable"
to
Wet
Dry Wet Dry
Wet
WATER YEAR
EXPLANATION
75 th percentile
(38,200)
Median
(26,300)
Dry Wet Dry
Wet
WATER YEAR
"Variable"
to
Dry
1962 1964 1966 1968 1970 1972 1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002
Sacramento River
Feather River
American River
Representative Water Year
Typical
1975
Yuba River
Cottonwood Creek
Other Sacramento Valley streams
Typical
1975
25 th percentile
(18,800)
Kings River
Tuolumne River
Stanislaus River
75 th percentile
(16.8)
Median
(13.0)
Merced River
Kern River
Other San Joaquin Valley streams
25 th percentile
(11.0)
"Variable"
to
Dry
1962 1964 1966 1968 1970 1972 1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002
Figure A16. A, Total inflow from 44 gaged streams flowing into the Central Valley, California, water years 1962–2003.
B, Average annual precipitation in the Central Valley, California, water years 1962–2003. C, Total surface-water flow into the Central
Valley, California, water years 1962–2003.
Dry
1990
Dry
1990
Wet
1998
Wet
1998