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<br />The annual average salinities of the waters arriving at Imperial Dam since 195 1, 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 by means of a bypass channel to the
<br />Santa Clara Slough on the Gulf of California and substituting for such waters an equal volume of
<br />other waters. The annual volumes of Well ton-Mohawk drainage waters discharged to the Gulf of
<br />California and substituted for by other waters for the deliveries to Mexico under Minute No. 242,
<br />since it became effective on June 24, 1974, are tabulated as follows:
<br />
<br /> ANNUAL VOLUME DISCHARGED
<br />YEAR ([HOUSAND CUBIC METERS) (ACRE-FEED
<br />1974 (Jun 2S - Dee 31) 140,180 113,64S
<br />1975 264,866 214,729
<br />1976 2S3,3S3 20S,39S
<br />1977 2SS,1l3 206,822
<br />1978 224,S40 182,036
<br />1979 219,472 177,928
<br />1980 190,73S 1 S4,630
<br />1981 183,082 148,426
<br />1982 184,6S 1 149,698
<br />1983 220,988 · 179,1S7 ·
<br />1984 IS4,944 .. 12S,61S"
<br />1985 IS9,987 129,704
<br />1986 \3S,747 110,OS2
<br />1987 120,S62 97,741
<br />1988 IS8,103 128,176
<br />1989 170,990 138,624
<br />1990 164,900 133,690
<br />1991 173,S83 140,726
<br />1992 124,716 101,109
<br />1993 7S,784 ... 61,439 ...
<br />1994 IS6,477 124.43S
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<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 />... 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 02/21/93 to 01/18/94 and were diluted by the high flows.
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