Irrigation as an ameliorative measure that, through the application of the irrigation system and the application of water, maintains soil moisture at a level that allows optimal growth and development of crops, that is, the achievement of satisfactory yields. The frequent occurrence of droughts, combined with the reduction of freshwater resources, forces EU Member States to define and apply adaptation measures based on water saving and efficient water use in agriculture. Droughts occur in Croatia on average every three to five years, and depending on their intensity and duration, they can reduce agricultural crop yields by 20 % to 92 %. In the paper, the available spatial bases are analyzed using GIS to identify potential water sources for irrigation. A 30-year series of the most important meteorological parameters (precipitation, temperature, solar radiation, humidity, wind speed) is obtained for the meteorological station Zadar-Aerodrom, which will serve as a basis for determining the water requirements of olive trees at a site in the municipality of Pridraga, with an area of 0.49 ha. Based on the obtained results, the appropriate irrigation system will be selected and the required dimensions of the selected system will be determined.