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Abstract
The purpose of any irrigation system is to convey water from asource to the field and to deliver it to the root zone of the crop.Awell designed and operated system will perform this task while meeting three general requests a- assurance of maximum economic return to the farmer :minimal loss of water during conveyance and application; and maintainance of long term productivity of the land through prevention of soil erosion, and soil salinization, and raising of the ground water table.The objective of this research is to estimate water and friction head losses and design the lateral lines in adrip irrigation systen for distributing water into the field with an acceptable degree of uniformity under different operating conditions.