The depth of aquifers ranges considerably, but most are between 5 and 30m beneath the surface.
Aquifer depth varies from area to area and depends on surrounding geologic formations, such as the depth of the underlying bedrock. Aquifers could be as deep as 100 feet below the surface. When wells are drilled into the ground and water is withdrawn faster than it is naturally replenished, this causes a localized lowering of the water table around the well. Basically, the depth of aquifers depends on how far beneath the surface the impermeable layer of rock is as well as how much water is taken from the aquifer in that region.
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