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<br />The annual average salinities of the waters arriving at Imperial Dam since 1951, the first full year of
<br />deliveries to Mexico under the 1944 Water Treaty, and of the waters made available to Mexico at
<br />the Northerly International Boundary since 1958 are graphically shown on Exhibit 2, which shows
<br />the effect of operations under Minute No. 242. The interim measure adopted by the United States
<br />to effect the agreed upon salinity differential, pending completion and operation of desalting projects,
<br />consists of discharging all Wellton-Mohawk drainage waters into a bypass channel to convey them
<br />to the Santa Clara Slough on the Gulf of California, and substituting for such waters an equal volume
<br />of other waters. The quantities of Well ton-Mohawk drainage waters discharged and substituted for
<br />by other waters for the deliveries to Mexico under Minute No. 242, since it became effective on June
<br />24, 1974, are tabulated as follows:
<br />
<br /> ANNUAL VOLUME DISCHARGED
<br />YEAR (THOUSAND CUBIC METERS) (ACRE-FEEl)
<br />1974 (Jun 25 - Dee 31) 140,180 113,645
<br />1975 264,866 214,729
<br />1976 253,353 205,395
<br />1977 255,113 206,822
<br />1978 224,540 182,036
<br />1979 219,472 177,928
<br />1980 190,735 154,630
<br />1981 183,082 148,426
<br />1982 184,651 149,698
<br />1983 220,988 · 179,157 ·
<br />1984 154,944 .. 125,615 ..
<br />1985 159,987 129,704
<br />1986 135,747 110,052
<br />1987 120,562 97,741
<br />1988 158,103 128,176
<br />1989 170,990 138,624
<br />1990 164,900 133,690
<br />1991 173,583 140,726
<br />1992 124,716 101,109
<br />1993 75,784... 61,439...
<br />1994 156,477 124,435
<br />1995 154,772 125,475
<br />
<br />* This includes an undetermined amount of flood waters due to breaks in a bypass canal levee in
<br />the United States.
<br />* * Includes Gila River water.
<br />
<br />* * * The low flows are due to damage on the drainage canal caused by Gila River flood waters. Drainage
<br />waters entered the Gila River from 02121/93 to 01/18/94 and were diluted by the high flows.
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