2. Lens formed aquitards that exist in the subsurface. They prevent downward penetration to the regional water tab.
3. Porosity is a measure of how much of a rock is open space. Permeability is a measure of the simplicity with which a liquid (water) can travel through a porous rock.
4. An aquifer is a rock that will hold and yield water. Good aquifers include sand, gravel, sandstone, conglomerates, and fractured rock.
5. A confined aquifer is sandwiched between impermeable layers, water moves relatively slow while an unconfined