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<br />limit pumping of groundwaters in its territory within five miles (eight kilometers)
<br />of the Arizona-Sonora boundary near San Luis to 160,000 acre-feet (197,358,000
<br />cubic meters) annually."
<br />
<br />In 1999, Mexico did not pump from its San Luis Mesa well field located within eight kilometers
<br />(five miles) of the boundary near San Luis. The annual volumes pumped from these well fields
<br />from 1975 through 1999 are tabulated as follows:
<br />
<br /> ANNUAL VOLUME PUMPED
<br />YEAR (THOUSAND CUBIC METERS) (ACRE-FEET)
<br />1975 131,030 106,227
<br />1976 120,722 97,870
<br />1977 159,905 129,636
<br />1978 121,172 98,235
<br />1979 29,063 23,562
<br />1980 17,735 14,378
<br />1981 148,742 120,586
<br />1982 162,498 131,738
<br />1983 22,437 18,190
<br />1984 8,963 7,266
<br />1985 37,373 30,299
<br />1986 13,308 10,789
<br />1987 64,453 52,253
<br />1988 157,374 127,585
<br />1989 173,551 140,700
<br />1990 167,848 136,077
<br />1991 153,227 124,223
<br />1992 81,374 65,971
<br />1993 7,237 · 5,867 ·
<br />1994 76,281 61,841
<br />1995 48,830 39,587
<br />1996 81,039 65,699
<br />1997 36,576 29,653
<br />1998 0.00 0.00
<br />1999 0,00 0,00
<br />
<br />* The reduced pumping was due to excess delivery from the Gila River flood flows.
<br />
<br />The United States Bureau ofRec1amation has completed 21 of the allowed 35 wells on the United
<br />States side, all located within eight kilometers (five miles) of the Arizona-Sonora boundary near San
<br />Luis, for protective and regulatory pumping. Construction of the remaining 14 allowed wells has
<br />been deferred until additional water supply needs make it necessary. Of the 21 completed wells,
<br />7 were pumped during 1999 for municipal and irrigation uses.
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<br />7
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