Lack of fresh water in some areas is a serious crisis. One way to reduce reliance on conventional sources of water is to collect rain water. This paper explores the feasibility of implementing a system to collect rainwater from the roofs of buildings of Birjand University of Agricultural Sciences and Natural Resources. The results of the water balance showed that rainwater collection significantly reduces levels of reliance on groundwater extraction even in dry months. The study that tried to collect water from the pavement and the roof of the area under study is compared with the maximum water demand for landscaping. But it can provide about twenty percent of the total needed green space in the whole year. The results showed that rainwater collected can provide about twenty percent of the water needed for green space, each year. This paper increases the policymakers and water resource managers’ attention to the knowledge and solutions regarding the use of water resources in accordance with the environment to prepare the grounds for the required funding and sufficient attention to the plans and policies.