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The ground water resources have become the main source of drinking water for communities. High utilization of water has caused drastic reduction of ground water level. In order to maintain designed supply rate, either a new well need to be installed or the depth of programming optimal depth of well can be obtained so that the designed option, using the nonlinear maintained and total expensive to be reduced. In this study a nonlinear programming model was developed and is used to predict the optimal depth of existing well extension in fariman city pilot. In this research positive water balance for ultimate discharge rate is assumed .