Decreasing recharge rates, which is one of the most significant impacts of climate change on groundwater resources, affects sustainable management of the coastal aquifer systems. The results of this study demonstrates that decreasing recharge rates has a more significant effect on the quantity and the quality of groundwater reserves compared to the effect of increasing pumping rates on a simulation period of 100 years. Moreover, there should be a compromise between the quantity and quality of groundwater and the pumping rate that will supply the increasing demand, which is even more severe under accelerating stresses exerted by the climate change. The results also indicate that decreasing groundwater recharge that may be imposed by the climate change reduces the sustainable pumping rates by almost one-third. Finally, it should be emphasized that groundwater quality has to be a binding constraint in the determination of the sustainable groundwater pumping policies for coastal aquifer systems.

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