UNAPPROPRIATED WATER

Public water of the state in streams, rivers, lakes, springs or groundwater in excess of that necessary to satisfy prior existing water rights.

UNCERTAINTY

Uncertainty is a parameter associated with the result of measurement that characterizes the dispersion of the values that could be reasonably attributed to the measured amount

UNCONFINED AQUIFER

Aquifer containing water that is not under pressure; water level in a well is the same as the water table outside the well.

UNDERGROUND STORAGE TANK (UST)

A tank located at least partially underground and designed to hold gasoline or other petroleum products or chemicals.

UNDERGROUND WATER

Subsurface water in the unsaturated and saturated zones. See also Ground water

UNDERSTOCKED

A stand of trees so widely spaced that even with full growth potential realized, crown closure will not occur.

UNDERSTORY

(a) The layer formed by the crowns of smaller trees in a forest. (b) The trees beneath the forest canopy.