Terms of Hydrology (V)

vadose water :

Any water that occurs in the unsaturated zone. (IGH)

valley glacier :

Glacier which flows down a valley.

valley storage :

Volume of water stored between any two specified points along a stream, inc ...

vapour pressure; vapor pressure (A) :

Partial pressure of water vapour in the air.

variable :

Quantity which may take any one of a specified set of values a variable in ...

variance :

Second central moment of a frequency distribution. (DST) . For a set of val ...

variate :

Quantity which may take any of the values of a specified set with a specifi ...

varied flow :

Flow occurring in streams having a variable cross section or slope.

vauclusian spring :

Exsurgence in a karstic region controlled by a natural siphon and flowing i ...

velocity curve :

Curve of distribution of measured point velocity usually over a vertical li ...

velocity head :

Theoretical height to which a liquid particle could be elevated by its kine ...

velocity of approach :

Mean velocity in a conduit or channel at a short distance upstream from a w ...

velocity rod :

Floating rod weighted at the base so that it travels in an almost vertical ...

velocity-area method :

Method of measuring the discharge of streams by determining the velocity of ...

velocity-contour method :

Determination of the discharge of a stream by measuring the elemental areas ...

vena contracta :

Minimum cross section of a jet of fluid discharging from an orifice or over ...

vigil basins (AU) :

Series of small (up to 25 km2) observational areas, mainly for long-term mo ...

viscosity :

Property of a fluid to resist shearing in the presence of velocity gradient ...

V-notch weir :

Contracted sharp-crested measuring weir notch with sides that form an angle ...