The North East and South East side of the country have limited water resource that is the cause of reducing precipitation patterns would significantly affect livestock production and potentially food security. Recently drought risk has affected high land areas and trends suggest that the risk has been increasing in Ethiopia. The annual rainfall across the country has fluctuated significantly which indicates that high seasonal anomalies in rainfall- a major contribute of food intensity. GIS is an important tool that can be used for optimal allocation of water resources of an irrigation project. CROPWAT 8.0 and CLIMEWAT 2 Tool window support dissection technology has been done identify the analysis of evapotranspiration, crop water requirement, irrigation water need and irrigation schedule in Addis Zemen, Amhara region, Ethiopia. Several input data (temperature, humidity, and wind speed) were used to calculate the reference evapotranspiration by Penman-Monteith method was 3.89mm/day. Crop and irrigation water requirement analysis in CROPWAT plat form were 476.8 and 460.9mm/dec respectively. Crop water requirement was categorize under very low sensitive (early stage), low sensitive stage (late stage) high sensitive stage (develop stage) and very high sensitive (middle stage). The irrigation water need throughout all growing season was 456.4mm. Irrigation was scheduled from October 9, 2021 to February 27, 2021.
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