Decline and Compensating Withdrawal Plan in Aleshtar Plain, Lorestan Province, Iran

Study area (Aleshtar plain) is located about 52 Km far from Khorramabad city (Lorestan Province centre) in the northwest direction. Excessive groundwater withdrawal in recent years, caused some hazards such as the high decline in groundwater level. In this research, the amount of aquifer drawdown is estimated to be about 4m using plain unit hydrograph according respective data of the study period (2002-09). Also, for determining the areas with critically low water levels as well as for simulating the groundwater responses to further withdrawal under various conditions in future, the mathematical model of the aquifer was developed. Then, by combination of mathematical model of the aquifer and geographical information system (GIS), simulation model of the aquifer was constructed via using the GMS software. According prediction outcomes of simulation model, the groundwater level would have about 3.5m further depression at the end of the consecutive five years'' period. Finally, some management approaches offered for appropriate withdrawal aimed at compensation of drawdown as well as hydraulics and economic considerations, and were evaluated by the aim of GWM software. Amounts of required water which lost due to withdrawal reduction, would be compensate through pumping from new proposed wells which are located outside of high depression area.