Rock type/structure:
Stronge, hard rock such as igneous or metamorphic rock. Sedimentary rocks such as Limestone are liable to cavaties if water is slightly acidic. Found on syncline not anticline as anticlines are more unstable and can result in slippage of beds under weight and gravity.
Faults/Joints:
Faults or joints as they reduce the stability of the rock allowing water to leak out of the reservoir. Also risk of fault being reactivated by the reservoir.
Permeablilty or Porosity:
Has to be highly impermeable and non pourus so not to allow any water to leak from the reservoir.
Valley:
Water is likely to fall in this area due to the high watertable draining water into the lowest part of the vally.
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