GENERAL GEOLOGY

Detailed explanation-1: -Because they have large and connected spaces, materials such as sand and gravel allow water to pass through, or permeate. They are thus known as permeable materials.

Detailed explanation-2: -Impermeable Material means material that is impenetrable by water and includes building coverage, asphalt, concrete, and brick, stone, and wood that do not have permeable spacing.

Detailed explanation-3: -Permeability is defined as the volume of a fluid of unit viscosity passing through a unit cross section of the medium in unit time under the action of a unit pressure gradient.

Detailed explanation-4: -The truth is, many things we normally consider to be waterproof actually have a measurable level of permeability. Plastic, glass, even solid steel are all permeable to a small degree.