Drought is one of the most important natural disaster that effects the various sections such as agriculture, social, economy, and water supply. To determine the drought amount and the associated impacts, a great number of tools are used. The aim of this study is to determine the drought amount in the region based on the Standardized Precipitation Index, Standardized Precipitation Evapotranspiration Index, Evaporative Demand Drought Index, Palmer Drought Severity Index and Reconnaisance Drought Index, which are all based on the potential evaporation and various parameters of precipitation, temperature, relative humidity, wind speed, and number of sunny hours are calculated. The five mentioned indices were calculated during the period of 1993 up to_ 2016 in Esfahan Province meteorological stations , including East of Esfahan, Kabootarabad, Daran, Sharreza, Najafabad and Mobarake and then eva‎luated. After calculating the above indices and using the zoning map, the studied stations were compared and the duration of dry and wet periods and their probability of occurrence were studied. After that, it was eva‎luated based on rain, evaporation potential , the station elevation with the assistance of the TOPSIS method. The results show that in the regions that have the dry and semi-dry climate such as Esfahan , Esfahan East , Shahreza, the drought occurrence was in the several years. In the regions with wet climate, the intensity of drought occurrence and wet periods were in the higher range. All of the results claim that the drought has been occured in all of the stations in year 2016. It is suggested that, considering the high potential of the TOPSIS method in ranking drought intensity, using the other related parameters such as soil humidity, water balance, , the amount of groundwater and surface water, and so on could be used to determine agricultural and hydrologic drought.

سعيد اسلاميان , عليرضا گوهري

محمد مهدي متين زاده , سارا آزادي

الهام فاضل , سعيد سلطاني كوپائي