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ABSTRACT Corn plants are the second most important food crop after rice, however, climate anomalies will affect the amount of production that is related to the water requirements available during the process of growing corn plants. This study aims to determine the amount of effective rainfall in one year and the need for irrigation water in one planting season, the water requirements for maize in a particular planting period and the comparison of the rate of evapotranspiration and the level of water that must be available to plants. This research was conducted from May to September at the Agricultural Technology Research Institute (BPTP) of South Sulawesi, Gowa Regency. The data obtained is then processed using the simulation method using a Windows-based application, Cropwat 8.0, from the results of the analysis with Cropwat, the results show that the water needs of corn plants in each growth phase are: Deve phase 107 mm / dec, Mid phase 132.9 mm / dec, and Late phase 107.4 mm / dec. Using cropwat can find out the amount of rain in 2014. Data for 1 year is 395.6 mm and the effectiveness of the rain that occurs is 355.9 mm so that it can give rise to how much irrigation water needs are needed in one planting period.