Management/conservation of stored water for optimum benefits can greatly enhance the effectiveness the ecological balance. Therefore Mustafa Uysal Park has been selected as study area for productivity of water harvesting in Antalya, Turkey. Water resources are being depleted quickly. Green areas in Antalya need more irrigation water in the summer due to climate. Therefore, the use of irrigation water from rainwater is very important. Because of these, Antalya was selected as study area. Estimated net runoff formula (rational method) has been used to determine water harvesting values for 12 months for study area. ArcHydro plugin in Arc-GIS is used to determine basins in the park. The needs of water for irrigation and evaporation value for the surfaces have been calculated. With the use of these values, the amounts of water which can be stored have been determined. The study shows that water harvesting of water sustainability. Rainfed production systems in public parks are important to maintain can save % 20.81 irrigation water in Mustafa Uysal Park. The results show that rainwater harvesting method is great importance of in terms of ecology and management of water.