GEOLOGY

Detailed explanation-1: -Permeability is the most important variable in groundwater. Permeability describes how easily water can flow through the rock or unconsolidated sediment and how easy it will be to extract the water for our purposes.

Detailed explanation-2: -Water moving below ground depends on the permeability (how easy or difficult it is for water to move) and on the porosity (the amount of open space in the material) of the subsurface rock.

Detailed explanation-3: -Porosity is a measure of the volume of voids in concrete. Permeability is the rate of flow of moisture through concrete under a pressure gradient. Voids through which moisture can move must be interconnected and of a certain size.

Detailed explanation-4: -After entering an aquifer, water moves slowly toward lower lying places and eventually is discharged from the aquifer from springs, seeps into streams, or is withdrawn from the ground by wells. Groundwater in aquifers between layers of poorly permeable rock, such as clay or shale, may be confined under pressure.

Detailed explanation-5: -The best sources of ground water, called aquifers, have high porosity and also high permeability. Sand, gravel, and fractured rock make the best aquifers.