Abstract
ABSTRACTThe objective of this study is to demonstrate the application of a predictive ground‐water potentiometric‐head model to estimate the profitability of irrigation in contrast to that of dry‐land farming. Unit cost per acre‐foot of water required for a variety of crops is used to determine the distributive impact of predicted aquifer depletion at 5‐year intervals during 20 years of simulated pumping. A land‐use planning scheme is proposed for identifying areas (one square mile or less) where various crop types can be irrigated based on benefit‐cost criteria for two arbitrary pumping rates as well as on future energy and well development costs. Maps showing areas of profitable production are presented for cotton and alfalfa as examples of crops requiring as much as 1 and 2 ac‐ft/ac/yr (0.30 and 0.60 ha‐m/ha/yr), respectively. Irrigation‐water needs and related profitability are presented as examples for several crops by using the model.
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