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When a permeable rock lies on top of an aquifer
When well-jointed rocks forming a hilly region absorb water via these joints
When a dyke cuts across a layer of permeable rock and water on the upper slope of the dyke is impounded
When the limestone rock overlies impermeable rocks on a scarp slope
When gently slopping layers of permeable rocks alternate with layers of impermeable rock resulting in springs at a point where the permeable one is exposed to the surface
When limestone rocks overlies impermeable rocks.
johnson mwenjera answered the question on January 9, 2018 at 17:57
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