A Study of Drought and Wet Year Assessment Models for Stations in East Azerbaijan Province

Annual rainfall data related to a 43-year period from a number of East Azarbaijan climatological stations were employed to analyze and model the precipitation toward a dtermination of drought as well as wet years. Results indicate the occurrence of different intensity drought phenomenon in all stations. As reqards the classification of the annual wet and dry seasons, normal precipitation among various alternate dry and wet years can be observed with the normal years having more stability and continuity as compared to wet and dry years. The Standardised Precipitation Index was recognised as a better and more accurate model as compared to the other models i.e., Nitzche model, and Dependable
Rainfall (DR) applied in this research .