Effect of Meteorological Drought on Groundwater Resource (Case Stusy: Komijan Aquefer in Markazi Province)

The purpose of this study was evaluation of the groundwater depth changes under meteorological drought in Komijan aquifer. For this reason, the data of 32 piezometric wells and three meteorological stations of Komijan, Ghahavand and khondab located around the aquifer, the effects of drought through the Standardized Precipitation Index (SPI), the percentage of normal (PNI) and deciles (DI) on groundwater Index (GRI) were studied. Assessments were based on Pearson correlation analysis on monthly scale and the time lag of 1, 3, 6, 9, 12, 18, 24 and 48 months. The results showed that each three drought indexes had more effective on groundwater index with 9 months time lag. Also, the percentage of stations wich had GRI significant correlation with SPI, DI and PNI were 20.14, 27.43 and 31.25 %, respectively. The average of gwoundwater depth in dry and wet years indicated that drought event led to reduced 1.17 m water height.