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Water is important for plant for its growth as well as for food production. There is a competition between municipal, industrial and agriculture users for the water available in reservoirs. Estimating irrigation water requirements is prerequisite for water project planning and management. The primary objective of irrigation is to apply water to soil to meet crop evapotranspiration (ETA) requirement when rainfall is insufficient to raise crops till harvesting. Hess defined crop water requirements as the total water needed for evapotranspiration, from planting to harvest for a given crop in a specific climate regime, when adequate soil water is maintained by rainfall and/or irrigation so that it does not limit plant growth and crop yield