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<br />.'
<br />
<br />3
<br />The results of operations under Minute No. 242 are shown graphi-
<br />cally on Exhibit 2, which also shows the salinity of the waters
<br />arriving at Imperial Dam and of the watars made available to
<br />Mexico at the Northerly International Boundary (N.I.B.) since
<br />1951, the first full year of deliveries to Mexico under the Water
<br />Treaty of 1944. The differential has been met through March 1992
<br />by interim measures in the united states and certain high flow
<br />years. In April 1992, the USBR under Title I PL 93-320 began
<br />operating the Yuma Desalting Plant (YDP), envisioned in PL 93-320
<br />as a means for permanent compliance with the salinity differen-
<br />tial. However, the YDP was shut down during the high Gila River
<br />flows during 1993.
<br />
<br />The interim measure adopted by the United states to effect the
<br />agreed upon salinity differential pending operation of a desalt-
<br />ing project, consists of discharging of all Wellton-Mohawk drain-
<br />age waters by means of a bypass channel to the Santa Clara Slough
<br />on the Gulf of California and substituting for such waters an
<br />equal volume of other waters. The quantity of Wellton-Mohawk
<br />drainage waters discharged to the Gulf of California and substi-
<br />tuted for by other waters for the deliveries to Mexico under
<br />Minute No. 242, since it became effective on June 24, 1974, are
<br />tabulated as follows:
<br />
<br />At the end of 1993 the USBR began consideration of utilizing the
<br />YDP on a standby status only and renewed other means of meeting
<br />the salinity standard.
<br />
<br />Year
<br />1974 (June 25 to December 31)
<br />1975
<br />1976
<br />1977
<br />1978
<br />1979
<br />1980
<br />1981
<br />1982
<br />1983
<br />1984
<br />1985
<br />1986
<br />1987
<br />1988
<br />1989
<br />1990
<br />1991
<br />1992
<br />1993
<br />
<br />Thousand
<br />Cubic Meters
<br />140,180
<br />264,866
<br />253,353
<br />255,113
<br />224,540
<br />219,472
<br />190,735
<br />183,082
<br />184,651
<br />220,988*
<br />154,944**
<br />159,987
<br />135,747
<br />120,562
<br />158,103
<br />170,990
<br />164,900
<br />173,583
<br />124,716
<br />75,784***
<br />
<br />Acre-Feet
<br />113,645
<br />214,729
<br />205,395
<br />206,822
<br />182,036
<br />177,928
<br />154,630
<br />148,426
<br />149,698
<br />179,157
<br />125,615
<br />129,704
<br />110,052
<br />97,741
<br />128,176
<br />138,624
<br />133,690
<br />140,726
<br />101,109
<br />61,439
<br />
<br />* This includes an undetermined amount of flood waters due to
<br />breaks in bypass canal levee in the united states.
<br />** Includes Gila River water.
<br />***The low flow is due to damage of the concrete lining for the
<br />Wellton Mohawk drainage canal caused by Gila River flood flows
<br />during the year. From 2/21/93 to 1/18/94 the drainage waters
<br />entered the Gila River, but were diluted by the high Gila
<br />River flows.
<br />
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