Abstract

Human societies in arid and semi-arid have felt the necessity of rainwater for agriculture and even husbandry activities. Thus, they have used various methods for rain water harvesting. Todays, in most of countries in the world particularly those countries that are encountered the lack of water, using different methods of rainwater harvesting has been increased in most of countries. They are located in arid and semiarid regions wherein there is not enough rain. So water harvesting techniques are used even in humid and semi humid regions especially in summer season. In this approach we have applied one of traditional rain water harvesting methods in northern part of Iran for the purpose of providing the irrigation water for citruses garden in spring and summer seasons. It is called as isolated surface slope plate which was applied to a garden in GhaemShahr which is located in Mazandaran province. This garden is included an apartment with two stories.  The first floor is belonged to settlement and in the ceiling floor is made water storage with 26 m³ capacity. Usually in every period of ten years the lack of water may occur. To solve this problem, the surface of the steep roof should be increased. On the other hand, if the surface of the garden increases, the surface of the steep roofs should be increased, too.