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<br />and Mexico of a comprehensive agreement on groundwater in the
<br />border areas, each country shall limit pumping of groundwaters in its
<br />territory within five miles (eight kilometers) of the Arizona-Sonora
<br />boundary near San Luis to 160,000 acre-feet (197,358,000 cubic
<br />meters) annually."
<br />
<br />In 1997, Mexico's pumping from its San Luis Mesa well field located within eight kilometers (five
<br />miles) of the boundary near San Luis amounted to 36,576,000 cubic meters (29,653 acre-feet). The
<br />annual volumes pumped from 1975 through 1997 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 />" . . . . - .. . -
<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 />lQQ7 ,,; ~7'; ?Q ,;~, .
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<br />* The reduced pumping was due to excess delivery from the Gila River flood flows.
<br />
<br />The U.S. Bureau of Rec1amation has completed 21 of the allowed 35 wells on the United States
<br />side, all located within eight kilometers (five miles) ofthe Arizona-Sonora boundary near San Luis,
<br />for protective and regulatory pumping. Construction of the remaining 14 allowed wells has been
<br />deferred until additional water supply needs make it necessary. Of the 21 completed wells, 3 were
<br />pumped during 1997 for municipal and irrigation uses.
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