Terms of Hydrology (G)

gaining stream :

Stream or stretch of stream which receives water from the saturat ...

gauge datum; gage datum (A) :

Vertical distance of the zero of a gauge referred to a certain da ...

gauge height; gage height (A) :

Height of a water surface above a gauge datum. It is used interch ...

gauge zero; gage zero (A) :

Elevation at which a water level gauge zero is set.

gauging section; gaging section (A) :

Cross-section of an open channel in which measurements of depth a ...

gauging site; gaging site (A) :

Location on a stream where measurements of water level and discha ...

geothermal gradient :

Increase in temperature of the Earth per unit of depth (approxima ...

geyser :

Intermittent thermal spring throwing up a column of hot water.

glacier :

Accumulation of ice of atmospheric origin generally moving slowly ...

glacier flood :

Sudden outburst of water released by a glacier.

glacier ice :

Any ice in, or originating from, a glacier, whether on land or fl ...

glaciology :

Science dealing with the properties and occurrence of ice, ice ac ...

global circulation :

General term for the motion system of the Earth's atmosphere embr ...

graded stream :

Stream that apparently has achieved an approximate state of equil ...

gradex method :

Method which allows the substitution of a frequency distribution ...

grading :

Degree of mixing of size classes in sedimentary material. Well gr ...

grains of ice :

Frozen raindrops or largely melted and refrozen snowflakes. Forme ...

gravel pack :

Graded, porous material introduced into the annular space between ...

gravitational water :

Water in the unsaturated zone which moves under the influence of ...

Gravity flow :

Flow of water in which the effect of gravity is predominant.

grease ice :

Thin film of ice, floating on the surface at the start of ice for ...

gross interception loss :

Rainfall evaporated from canopy and litter.

ground data :

Information obtained on surface/subsurface features to aid in int ...

ground track :

Vertical projection of the actual flight path of an aerial or spa ...

groundwater :

Subsurface water occupying the saturated zone.

groundwater basin :

Physiographic unit containing one large or several connected or i ...

groundwater dam :

Body of material which is impermeable or has only low permeabilit ...

groundwater dating :

Determination of the time between the recharge of groundwater and ...

groundwater depletion curve :

Curve showing the rate of release of water from storage in an aqu ...

groundwater divide :

Line on a water table or piezometric surface on either side of wh ...

groundwater flow :

Movement of water in an aquifer.

groundwater hydrology :

That branch of hydrology which deals with groundwater, taking int ...

groundwater level :

Elevation, at a certain location and time, of the water table or ...

groundwater mining :

Withdrawal from an aquifer containing fossil water.

groundwater mound :

Mound-shaped or ridge-shaped feature in a groundwater table, buil ...

groundwater overexploitation :

Withdrawal from a groundwater reservoir in excess of the average ...

groundwater recession :

Decreasing rate of groundwater discharge to surface water bodies ...

groundwater runoff :

That part of the runoff which has passed into the ground, becomes ...

groundwater station :

Station at which data on groundwater are obtained on one or more ...

groundwater storage :

Quantity of water in the saturated zone of an aquifer. (IGH)

gully :

Channel deeply eroded by water which flows only due to storm-wate ...

guttation :

Process by which plants expel liquid water from leaves in excess ...

gutter :

Shallow waterway provided at the margin of a highway for surface ...