Water scarcity

The volumetric abundance, or lack thereof, of freshwater resources. Scarcity is human driven, it is a function of the volume of human water consumption relative to the volume of water resources in a given area. As such, an arid region with very little water, but no human water consumption would not be considered scarce, but rather arid. Water scarcity is a physical, objective reality that can be measured consistently across regions and over time. Water scarcity reflects the physical abundance of freshwater rather than whether that water is suitable for use. For instance, a region may have abundant water resources (and thus not be considered water scarce) but have such severe pollution that those supplies are unfit for human or ecological uses.