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Constraints 55 3.3.1. Land and water constraints for irrigation in both the Ogallala and Western zones 57 3.3.2. Constraints on irrigation from the Ogallala Aquifer 70 3.3.3. Demands and minimum quantities produced 77 3.4. Solutions 78 4. RESULTS 81 4.1. Solution I 1990: The Base 81 4.1.1. Prices and resource use in Solution I 81 4.1.2. The Ogallala Zone in Solution I 85 4.2. Effects of Increased Energy Prices in the 1990 Solutions 88 4.2.1. Effect of the decline in the water table on Solution II 1990 4.2.2. Changes in resource use 4.2.3. Regional differences 4.3. Effect of Decreased Demand 4.3.1. Effect of the decline of the water table on Solution III 1990 4.3.2. Effects of the decrease in demand Oïl rêBOuf Cêô ^ pflCêB^ âûu iïlCOîûê 4.3.3. Regional differences 4.4. Extension to 2000 4.4.1. Solution I 2000 4.4.2. The effect of Increased energy prices 110 5. SUMMARY, QUALIFICATIONS, AND IMPLICATIONS 113 5.1. The Problem and Methodology 113 5.2. Limitations 117 5.3. Results and Conclusions 120