عنوان مقاله [English]
Aquifer in alluvium of this plain is 520 km2. The aquifer is recharged from direct infiltration of precipitation and surface runoff, return flow from agricultural, industrial and domestic uses and groundwater input and discharged through water abstraction for different consumptions and groundwater output. The groundwater level hydrograph of shows that the level and storage of water continously decreased in the last years. In this research, times series model was used for forecasting groundwater level of plain in future. The groundwater levels in 1984-2003 were used as observed data. Then with time series model, the ARIMA(1,1,0) model was fitted and of groundwater level for next 20 years were forecasted. The results of forecasting model show that in the next 20 years the groundwater level will decreases by 17.5m. So, with limitation of water resources, drawdown of groundwater level and increase of water consumption in future, groundwater management in Hamedan-Bahar plain is essential for sustainable use of groundwater resources.