The Effect of Drought Phenomenon on the Surface of Groundwater Aquifer in Qazvin Plain in Iran

As one of the most catastrophic atmospheric events, drought affects various aspects environment. Groundwater resources are sectors that influenced by long-term droughts and received insufficient attention compared to other Rainfall data collected 23 metrological stations for 20 years (2005, 2010, 2015,2020) was used investigate event its situation in Qazvin plain, central plateau Iran. Drought characteristics evaluated using 24-month standardized precipitation index (SPI). The results SPI indicated precipitation, excessive use groundwater irrigation, utilization uncontrolled wells caused a significant reduction aquifers from 2015 2020. To assess performance SPI, five-year moving average available calculated, result confirmed outcomes SPI. Appropriate geostatistical interpolation methods generate maps zoning. Based on this investigation northeastern part study area, June November had highest lowest rate drought, respectively. linear regression between annual changes aquifer level exposed correlation R2 = 0.4253. Furthermore, 0.614. Considering study, levels plain negative difference previous (2005 2010).