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1
Hydrologic History of the Sacramento-San Joaquin Delta
2
title
Report of the Board of Commissioners on Irrigation
Deltaca. 1873
3
Early Complicated Network
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Became Simple Web Network
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Major Inflows to Delta(monthly average flows in maf/mo)
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Major Inflows to Delta(monthly average flows in maf/mo)
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Major Inflows to Delta(monthly average flows in maf/mo)
8
Major Inflows to Delta(monthly average flows in maf/mo)
9
Major Inflows to Delta(monthly average flows in maf/mo)
10
Impacts on the Delta(annual flows in maf/yr)
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Total Delta Impairments(upstream and exports in maf/yr)
0
10
20
30
40
50
Unimpaired 1949-1968 1986-2005
-33%-48%
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Total Delta Impairments(upstream and exports in maf/yr)
0
10
20
30
40
50
Unimpaired 1949-1968 1986-2005
-33%-48%
13
Total Delta Impairments(upstream and exports in maf/yr)
0
10
20
30
40
50
Unimpaired 1949-1968 1986-2005
-33%-48%
14
Total Delta Impairments(upstream and exports in maf/yr)
0
5
10
15
20
25
30
35
Unimpaired 1949-1968 1969-1985
An
nu
al V
olu
me
(maf
)
Delta Outflow Exports Delta Use Upstream Effects
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Internal Flow Changes
Sum of Old and Middle Rivers
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
-12000 -8000 -4000 0 4000 8000 12000 16000 20000 24000 28000
Per
cent
Exc
eede
nce
of F
low 1925-2000 Unimpaired
1986-2005 Historical
Natural downstream flows (cfs)Upstream flows
A
B
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Western Delta Salinity
0%
20%
40%
60%
80%
100%
40 50 60 70 80 90 100 110X2 Distance from Golden Gate Bridge (km)
Per
cent
Exc
eede
nce
of X
2 Lo
catio
n
1921-2003 Unimpaired
1949-1968 Historical
1986-2005 Historical
A
B
C
CQ MZ CH CO EM RV
17
Water Use Trends(annual flows in maf/yr)
Data courtesy of TNC
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18