WSP10764

• File Number: 8277.200
• Description: California Water Resources Association/California Salinity Projects
• State: CA
• Basin: Colorado Mainstem
• Date: 1/1/1963
• Title: Colorado River Board of California Annual Report 1969
• Water Supply Pro - Doc Type: Annual Report

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Table 9
MINUTE NO. 218 OPERATION

1964 Calendar
Year
(Year Previous
ro Agreement)

1st Year
1I-/6.6J
to
11./J-66

2nd }'ear
11-/6.66
to
11-15-67

Jrd }'ear
1/./6.67
to
11./f-68

.hh }'ear
1/./6.68
ro
ll-lJ-69

Wellron-Mohawk Drainage
Discharge, Ac. Ft. ........................ 181,150
Salt Load, Tons ........................... 1,252,000
Diverted Around Morelos Dam, Ac. Ft..

ByA~~sF?~~.i.~~..~.i.~~~.~.~. .~.~~~~~. .?~.~~.~~...
Makeup from Storage Release, Ac. Fr.
(Approx.) ........ ...... ..... ...... ............ ......... ........
Avg. Salinity of River at Northerly Bound-
ary, PPM ................. 1,310

Mohawk Project in Arizona be diverted
around Morelos Dam through a bypass chan-
nel. It also provides that, if the bypass occurs
during times when Mexican delivery orders
are at the Treaty minimum of 900 cubic feet
per second, the flow of the river at Morelos
diversion dam will nevertheless be not less
than 900 cubic feet per second.
At a meeting of the seven-state Committee
of Fourteen held on November 21, 1969, the
U.S. Commissioner, International Boundary
and Water Commission, and Bureau of Rec-
lamation officials reported the results of the
fourth year of operation of the bypass
channel, ending November 15, 1969. The
Chief Engineer of the Board attended as a
member of the Committee. Table 9 summa-
rizes some pertinent statistics from the Com-
mission's report.
Table 9 shows that during the first four
years of operation under Minute No. 218 the
required makeup from storage in the United
States has been a total of 147,200 acre-feet.
The annual average salinity of Colorado
River treaty deliveries to Mexico at the Inter-
national Boundary was less in the fourth year
of operation than in the first three years. The
average decreased from 1310 ppm in the year
prior to the agreement, to 1180 ppm in the
fourth year of operation under Minute No.
218.
The daily average salinity of Colorado
River treaty deliveries to Mexico at the

42

216,100
1,399,000
100,800

54,000

15.000

1,230

211,200
1,324,000
99,000
58,300
35.000
1,210

219,800
1,317,000
103,900

218,100
1,226,000
109,200

52,600
47,300

59,100
49,900

1,190

1,180

northerly boundary varied from 830 ppm to
1380 ppm during the 1969 calendar year, The
average salinity of Wellton-Mohawk drain-
age waters in 1969 was estimated at 4140
ppm, about 270 ppm less than 1969. Plate 12
shows the salinity and flow of the Wellton-
Mohawk drain, the Colorado River at Im-
perial Dam, and at the northerly boundary
with Mexico.
Minute No, 218 expires on November 15,
1970, and the U.S. Commissioner recom-
mended that Minute No. 218 be renewed.
This was agreed to by the Committee of
Fourteen members.
In June 1969 Mexico initiated construction
work on the rehabilitation of the Mexicali
Valley irrigation project with $18 million of
work now under contract, The work consists
principally of improvements to, and concrete
lining of, the canal system.

Review and Analysis of
Reports on Water Quality
Several reports concerning water quality
of the Colorado River Basin were reviewed
and analyzed during the year.
Quality of Water, Colorado River Basin,
Progress Report No.4. This report, dated
January 1969, is prepared biennially by the
U,S. Department of the Interior and is a con-
tinuing study of the quality of water of the
Colorado River system and its suitability for
all uses.