In this study, the CROPWAT 8.0 model was used to calculate the water needs of maize crops in Jowhar. The United Nations Food Agriculture Organization's decision-support computer software, CROPWAT 8.0, is used to calculate ETo, effective rainfall, crop water need (ETc), and irrigation requirements. Climate, soil, and crop data were obtained using FAO CLIMATWAT 2.0. ETo was calculated as 4.75 mm per day on a yearly basis. Maize irrigation need was predicted to be 242.2 mm during the full growing season, whereas effective rainfall to meet maize crop water requirements was determined to be 203.3 mm. Total maize evapotranspiration was 403.7 mm, with net and gross irrigation calculated to be 248.3 and 354.7 mm, respectively. Field experiments should be carried out throughout the same season and cropping patterns to check the precision of the crop water requirement prediction.
