One of the main obstacles of sustainable dcvelopment has been the limitation of water resources and the shortage of precipitation. In orther to challenge this problem, cloud seeding is considered one of the modem methods in this respect. One of the most necessary factors in suitable site selection for cloud seeding is precipitation climatology. The present research has been performed in this region, using of daily precipitation data of region staions in 20 year statistical period.
Findings of this research show that more than 80 percent of yearly rain in this region has been in winter and early in spring (between December to April!) while more than go percent of this rain is in winter. The rain is not the same in all places and isohyet is more than 300mm so that the most yearly rain is an the central high mountains such as Flezar, laleh zar and the Barez mountaions. About 35 Percent of rain in the most region stations devotes to rainy periods of heavy (between 10 to 30mm) and rainy periods of exceptional (more than 30mm). More than 60 percent of wet periods is made up one day rain 30 percent of two day successive rain and less than 10 percent 3 or greater day rain. Rainy periods of heavy and exceptional and 3 or greater - day rains are also in centeral mountains of this region.
Therefore from December till Aprill and the southern slops of central mountains of region, have provided suitable conditions for the performance of cloud seeding projects.
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