Definitions by Tiger128

aquitard 

An aquitard is an underground layer of something else that does not allow water to flow through it.

An aquitard is clay or really solid rock that is nonpermeable.

aquitard by Tiger128 May 7, 2009

permeable 

Having pores or openings that permits liquids/gases to pass through

Gravel, sand, and soil are permeable.

permeable by Tiger128 May 7, 2009