A simulation model is presented to investigate the interaction between the surface water reservoir behind Wala dam in Jordan and the groundwater aquifer in the area. MODFLOW software with RES package is used with the available measured data to calibrate the aquifer parameters (transmissivity, specific storage, specific yield, and vertical hydraulic conductivity of the reservoir bed). Steady and transient verification processes will be conducted. Two scenarios are studied to predict the quantity of groundwater that can be pumped from Heedan wells to Amman. This study will show the benefit of natural recharge from surface water to groundwater and the rate of pumping water to Amman can be raised to five times the rate before the dam construction.
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