COMPUTER-MODEL FOR ON-FARM IRRIGATION SYSTEM-PLANNING

A microcomputer model is developed for use as a planning tool to aid i n the sequence of development, evaluation and selection of the best al ternative on-farm irrigation system plan. The model is used to predict operation of an on-farm irrigation system under given site-specific c onditions and select the best system plan from a wt of alternatives. T he best system plan is selected based on maximization of annualized ne t returns to land and management. Application of the model to a case s tudy is presented. The consequences of limitations in water, energy an d labor use and/or different economic scenarios are evaluated as it co ncerns system plan selection.