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<br />001434 <br />Summary of Water Resources in Mexico <br /> <br />. <br /> <br />. The Rio Colorado Irrigation District reports that wells are used to irrigate approximately <br />135,500 acres (or 30%) of the irrigable land in Mexicali Valley and 40,000 acres (or 60%) of <br />the irrigable land in San Luis Valley <br /> <br />Reported and Estimated Volume of Groundwater <br />Extracted Mexico's Irrigation District 14 <br />Intake at <br />Volume <br />Source Morelos <br />(acre-feet) (acre-feet) <br /> <br />1,398,700 <br />1,395,500 <br />1,976,700 <br />1,897,700 <br /> <br />IBWC 2,346,200 <br /> <br />Year <br /> <br />1990 <br />1992 <br />1993 <br />1999 <br />1979-1981 <br />1983-1988 <br />1978,1982, <br />1989 <br /> <br />900,000 <br />690,000 <br />807,000 <br />730,000 <br /> <br />CNA <br />IBWC <br />IBWC <br />CNA <br /> <br />548,500 <br /> <br />650,600 <br /> <br />IBWC <br /> <br />1,399,400 <br /> <br />Source: Pacific Institute, 2001, "Missing Water: The Uses and <br />Flows of Water in the Colorado River Delta Region", p. 24 <br /> <br />Flows to the Colorado River Delta. Ciene2a de Santa Clara. and the Salton Sea <br />. Colorado River water (surface water and groundwater) that is not consumed by irrigated <br />crops, evapotranspiration in the Mexicali and San Luis Valleys, or municipal and industrial <br />users in San Luis-RioColorado, Mexicali, Tecate, an Tiajuana-Rosarita eventually flows to <br />the Cienega de Santa Clara, Colorado River Delta, or the Salton Sea <br /> <br />Cienega de Santa Clara <br />. Drainage from irrigated lands in the San Luis Valley flows to the Riito Drain which flows to <br />the Cienega de Santa Clara <br /> <br />. Approximately 25,000 acre-feet per year flows from the Riito Drain to the Cienega <br /> <br />. The primary source of water flowing to the Cienega is the drainage water from the Wellton- <br />Mohawk Irrigation and Drainage District. The drainage from WMIDD is routed by a lined <br />canal approximately 37 miles from the SIB to the Cienega <br /> <br />. The average annual discharge from the WMIDD bypass drain for the period 1990-2001 IS <br />107,700 acre-feet per year.. <br /> <br />Colorado River Delta <br />. The sources of Colorado, River water that flows into the delta region include Colorado River <br />. flows not diverted at Morelos Dam, municipal/industrial wastewater and sewage effluent <br />from San Luis-Rio Colorado" and agricultural drainage from southern Mexicali Valley that <br />flows to the delta via the Rio Pescaderos and Rio Hardy <br /> <br />. The combined estimated mean annual flow of agricultural drainage to the delta region from <br />the Rio Pescaderos and Rio Hardy is approximately 70,000 acre-feet <br /> <br />SNW A Resources 4/24/02 <br />