A Preliminary Assessment of Crop Production and Estimated Irrigation Water Use for Chihuahua, Mexico Presented at “Free Trade of the Americas, the WTO.

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A Preliminary Assessment of Crop Production and Estimated Irrigation Water Use for Chihuahua, Mexico Presented at “Free Trade of the Americas, the WTO and New Farm Legislation: Responding to Challenges and Opportunities” San Antonio, Texas, May 24, 2002 Parr Rosson, Aaron Hobbs, and Flynn Adcock Texas A&M University

Background U.S. - Mexico 1944 Water Treaty Mexico to Deliver 350,000 Acre Feet (AF) to the U.S. Annually from Rio Grande Mexican Deficits Began in 1995 Currently a cummulative Debt of Approximately 1.5 Million AF U.S. to Deliver 1.5 Million AF to Mexico Per Year from Colorado

Methodology Annual Production, Acreage and Yield Data Collected from SAGARPA for the Entire State of Chihuahua, Mexico Analysis of Trends CropWat Version 7 Penman-Monteith Method

CropWat Estimated Evapotranspiration Rate (ETo) Calculated for Chihuahua, Mexico Rainfall Measured for Chihuahua, MX Medium Soil Type Irrigation when 25% of ETo, to refill to soil capacity Plant date set by crop Irrigation Efficiency estimated at 50%

Penman-Monteith Penman-Monteith Monthly ETo Calculated for Chihuahua by CropWat Coefficients from FAO Multiplied the monthly ETo by the Coefficient For the Season then Subtracted Out Rainfall for the Time Period

Percent Increases in Harvested Acres, Production and Yield for Chihuahua For Major Crops Source: SAGARPA; Increases for 31 crops included in study.

Crop Acreage, 1999 Corn Alfalfa Cotton Pecans Apples Dry Beans Bell Peppers Source: SAGARPA

Further Research Update 2000 and 2001 Data for All Crops Change Efficiency Levels For a Range of Estimates –Determine Efficiency of Delivery of Water to the Farm –Determine Application Efficiency in the Field Factor Yields Into Irrigation Requirements Equation Determine the proportion of ground water use and surface water use

Conclusions Total Acreage and Production have continued to increase since the drought began in Lower Rainfall and Increased Water Use Have Reduced Flows to the Rio Grand. Analysis of Irrigation Districts Would Improve Estimates

Potential Solutions Improved Efficiency of Water Delivery and Use in Chihuahua Improved Efficiency of Water Delivery and Use in Lower Rio Grande Valley Form and Implement Effective Binational Water Management Planning