WATER TERMS

term	description
VAPOR	The word vapor is frequently used to describe a substance which, though now in a gaseous phase, generally exists as a solid or liquid at room temperature.
VAPOR RETARDER	A continuous plastic membrane which surrounds the entire thermal envelope of a house and prevents moisture penetration into the wall cavity. This is generally not required in the Austin climate for moisture control, but may serve as an effective air infiltration barrier.
VESTED WATER RIGHT	The right granted by a state water agency to use either surface or ground water.
VIRGIN FLOW	The streamflow which exists or would exist if man had not modified the conditions on or along the stream or in the drainage basin.
VOLCANIC WATER	Juvenile water (new water) furnished by lava flows and volcanic activity.
VALLEY	An area of land that is lower than the land on either side of it. Sometimes a stream may run through it.
VAPORIZATION	The change of a substance from a liquid or solid state to the gaseous state.
VOLATILE ORGANIC COMPOUNDS (VOCs)	VOCs are made as secondary petrochemicals They include light alcohols, acetone, trichloroethylene, percholoroethylene, dichloroethylene, benzene, vinyl chloride, toluene, and methylene chloride. These potentially toxic chemicals are used as solvents, degreasers, paints, thinners, and fuels. Because of their volatile nature, they readily evaporate into the air, increasing the potential exposure to humans. Due to their low water solubility, environmental persistence, and widespread industrial use, they are commonly found in soil and ground water.

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