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.! 001446 Summary of Water Resources in Mexico . · The Rio Colorado Irrigation District reports that wells are used to irrigate approximately 135,500 acres (or 30%) of the irrigable land in Mexicali Valley and 40,000 acres (or 60%) of the irrigable land in San Luis Valley Reported and EstimatEld Volume of Groundwater Extracted Mexico's Irrigation District 14 Volum.~ Intake at Year Source Morelos (acre-feElt) (acre-feet) 1990 900,000 CNA 1,398,700 1992 690,000 IBWC 1,395,500 1993 807,000 IBWC 1,976,700 1999 730,000 CNA 1 ,897,700 1979-1981 548,500 IBWC 2,346,200 1983-1988 1978, 1982, 650,600 IBWC 1,399,400 1989 Source: Pacific Institute, 2001, "Missing Water: The Uses and Flows of Water in the Colorado River Delta Region", p. 24 Flows to the Colorado River Delta, Cieneea de Santa Clara, and the Salton Sea · Colorado River water (surface water and groundwater) that is not consumed by irrigated crops, evapotranspiration in the Mexicali and San Luis Valleys, or municipal and industrial users in San Luis-RioColorado, Mexicali, Tecate, an Tiajuana-Rosarita eventually flows to the Cienega de Santa Clara, Colorado River Delta, or the Salton Sea Cienega de Santa Clara · Drainage from irrigated lands in the San Luis Valley flows to the Riito Drain which flows to the Cienega de Santa Clara · Approximately 25,000 acre-feet per year flows from the Riito Drain to the Cienega · The primary source of water flowing to the Cienega is the drainage water from the Wellton- Mohawk Irrigation and Drainage District. The drainage from WMIDD is routed by a lined canal approximately 37 miles from the SIB to the Cienega · The average annual discharge from the WMIDD bypass drain for the period 1990-2001 IS 107,700 acre-feet per year. . Colorado River Delta · The sources of Colorado River water that flows into the delta region include Colorado River . flows not diverted at Morelos Dam, municipaVindustrial wastewater and sewage effluent from San Luis-Rio Colorado" and agricultural drainage from southern Mexicali Valley that flows to the delta via the Rio Pescaderos and Rio Hardy · The combined estimated mean annual flow of agricultural drainage to the delta region from the Rio Pescaderos and Rio Hardy is approximately 70,000 acre-feet SNW A Resources 4/24/02