Study of Social and Economic Meteorological Drought Index (Case study: KohgiloyehVaBoyerahmad province)

Drought refers to a random condition of severe reduction of water supply availability compared to normal
value, extending along a significant period of time over a large region. Accordingly, the objective of this research
was to investigate the effect ofagricultural and socio-economic, meteorological drought, during the studied
period. For this purpose, from the twenty five rain-gauge stations during the years of 1364 to 1388 were used.
For this purpose standard precipitation index (SPI) was determined as well as for investigate meteorological
drought. Eventually we compared decreasing and increasing livestock and agricultural production or losses
in wet and dry years. The results of the analysis showed that most severe meteorological drought in the most
stations occurred in 86-87 year. The forage production in drought and normal conditions showed that we
had decreasing around 28, 58 and 36 percent in summer, winter quarter pastures and total forage production
respectively, also comparing forage production during 86-87 years than to 10 years average showed that
decreasing in summer and winter quarter pastures were 89746, 30333 and 109689, 41925 tons, respectively.