Terms of Hydrology (L)

labelling; labeling (A) :

Adding a tracer to water or to sediment to follow their movement.

lagoon :

Shallow body of water which has a shallow, restricted inlet from ...

lag-time :

Time from centre of mass of rainfall to centre of mass of runoff, ...

lake :

Inland body of water of considerable size.

lake ice :

Floating ice formed in lakes.

lake percentage :

Proportion of river basin covered by lakes, in percent.

laminar flow :

Flow of a fluid in which the viscous forces are predominant. In c ...

land ice :

Ice which forms from rain or snow on land.

Laplace equation :

Second-order partial differential equation of the elliptic type. ...

laser :

Instrument which permits (intense) pulses of light waves to be di ...

lateral inflow :

Inflow of water to a river, lake or reservoir along any reach fro ...

Leaching :

(1) Removal of salts from upper soil layers by relatively salt-fr ...

leaching requirement :

Fraction of the water entering the soil that must pass through th ...

Lead :

Navigable passage through floating ice.

leakage :

In groundwater, the flow of water from or into an aquifer through ...

leakage coefficient :

Quantity of water that flows across a unit area of the boundary b ...

leakage factor :

Characteristic length for a leaky aquifer (large for little leaka ...

leaky aquifer :

Aquifer overlain and/or underlain by a relatively thin semi-pervi ...

lethal concentration :

Concentration of a toxic substance at which 50% of the fish, or a ...

levee :

Water-retaining earthwork used to confine streamflow within a spe ...

limnograph :

Continuous record of stages on a chart made by a water level reco ...

Limnology :

Science that deals with the study of lakes and open reservoirs, i ...

lipids :

Collective name for oils, fats and waxes.

Litter :

Uppermost layer of organic debris, composed of freshly fallen or ...

live storage :

Volume or cubic capacity of a lake or reservoir between the maxim ...

local inflow :

(1) Water entering a stream between two gauging stations. (GHP) ( ...

log-normal distribution :

Transformed normal probability distribution in which the variate ...

longitudinal section :

Vertical section along a channel at its centre line.

long-term hydrological forecast :

Forecast of the future value of an element of the regime of a wat ...

loop rating curve :

Double-valued part of the rating curve in which the higher values ...

losing stream :

Stream or reach of stream that is losing water to the ground, and ...

low water :

(1) State of the tide when the water level is lowest for any give ...

lower reach :

Part of a stream channel in the lower region of a drainage basin.

low-flow channel :

Stream channel occupied during periods of low flow.

Lysimeter :

Vessel containing local soil placed with its top flush with the g ...