The purpose of this paper is to assess the severity of climate change on drought conditions Vtrsaly province, province by conducting standardized precipitation drought zoning and mapping the extent of drought. To assess the drought situation, data from all weather stations collected in the study area and the quality and uniformity of rainfall data were examined.
In order to study the drought of the study area, three meteorological stations with the Ministry of Energy during the period of 20 years (74 to 94) were analyzed. Library and field data collection methods and to determine potential trends of climate change and drought, drought commonly used coefficients.
Therefore, based on available data can be indicators of drought like the Standardized Precipitation Index (SPI) used. Time scales of SPI in the first half, the second half of the year was calculated and areal extent watershed maps for these periods were produced in GIS.
The results showed that the areal extent in 1382-83 was more than statistical Sayrsalhay and large parts of the province and watershed are dominated by drought. 1383 annual drought map shows that most of the catchment Azhvzh the SPI class and a severe drought have been in drought conditions in the basin of Minab, Grove, Sereni, Hsnlngy and Middleman drought conditions that need to reduce the effects of drought in measures taken in these areas.
