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<br />In 1986, Mexico's pumping from its San Luis Mesa well field within five miles
<br />(eight kilometers) of the boundary near San Luis amounted to 10,789 acre-feet
<br />(13,308,000 cubic meters). The following quantities were pumped in calendar
<br />years 1975 through 1986.
<br />
<br /> Thousands of
<br />Year Acre-Feet Cubic Meters
<br />1975 106,227 131,030
<br />1976 97,870 120,722
<br />1977 129,636 159,905
<br />1978 98,235 121,172
<br />1979 23,562 29,063
<br />1980 14,378 17,735
<br />1981 120,586 148,742
<br />1982 131,738 162,498
<br />1983 18,190 22,437
<br />1984 7,266 8,963
<br />1985 30,299 37,373
<br />1986 10,789 13 , 308
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<br />In 1986, as in the previous three years, Mexico's pumping of groundwater was
<br />reduced because flood control releases from the dams in the U.S. resulted in
<br />ample waters into the river to enable gravity diversions by Mexico to serve
<br />its needs.
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<br />The US Bureau of Reclamation (USBR) has completed 21 of 35 wells on the US
<br />side within five miles of the Arizona-Sonora boundary near San Luis for
<br />protective and regulatory pumping and 18 of the 21 wells were pumped in 1986.
<br />The remaining 14 wells have been deferred until water supply needs make
<br />construction necessary.
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<br />The United States pumped from domestic, municipal, and irrigation wells
<br />located within five miles of the boundary near San Luis the following
<br />quantities.
<br />
<br />Year Acre-Feet
<br />1975 26,787
<br />1976 22,738
<br />1977 22,990
<br />1978 17 , 900
<br />1979 25,418
<br />1980 28,527
<br />1981 38,463
<br />1982 40,954
<br />1983 16,707
<br />1984 15,467
<br />1985 13,635
<br />1986 *
<br />
<br />Thousands of
<br />Cubic Meters
<br />
<br />33,041
<br />28,047
<br />28,358
<br />22,079
<br />31,353
<br />35,188
<br />47,443
<br />50,516
<br />20,608
<br />19,078
<br />16,818
<br />*
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<br />The Commission is continuing, under Minute No. 242, its program for exchange
<br />of groundwater data for the major groundwater baa ins lying partly in the
<br />United States and partly in Mexico including the Colorado River delta area.
<br />The objective of the exchange is to make available hydrologic, geologic and
<br />water quality data in either country, to both Sections of the Commission to
<br />enable evaluation of international ground water baains conditions.
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<br />* Data to be supplied later.
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