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overland flow

The flow of water over a hillslope surface. It may be laminar, turbulent, and transitional or consist of patches of any of these flow states (A. J. Parsons and A. D. Abrahams1992). Horton ...

overland flow

overland flow   Quick reference

A Dictionary of Environment and Conservation (3 ed.)

Reference type:
Subject Reference
Current Version:
2017

... flow ( sheet flow ) The flow of water over the ground surface towards stream channels...

overland flow

overland flow   Quick reference

A Dictionary of Geography (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

... flow The flow of water over a hillslope surface. When water infiltrates a soil and all the pore spaces are full, the soil is saturated and the water table is at the surface. Overland flow will then occur. This is saturation-excess overland flow , which can occur at much lower rainfall intensities than those required to generate infiltration-excess overland flow (also known as Hortonian overland flow ). Saturation-excess overland flow can occur at the foot of a hillslope even when it is not raining. Overland flow may be laminar, turbulent, and...

overland flow

overland flow   Reference library

The Oxford Companion to the Earth

Reference type:
Subject Reference
Current Version:
2003

... flow The term ‘overland flow’ refers to the flow of water over a hillslope surface. This can occur in one of two ways. First, it is generated when the rainfall intensity exceeds the surface infiltration rate. The excess rainfall then accumulates on the soil surface in small depressions. Once these depressions are filled, the water spills out and flows downslope as overland flow. Overland flow originating in this way is called Horton overland flow . For a given rainfall intensity, the occurrence of Horton overland flow and the rate at which it takes...

Hortonian overland flow

Hortonian overland flow   Quick reference

A Dictionary of Geography (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

...overland flow An overland flow of water occurring more or less simultaneously over a drainage basin when rainfall intensity exceeds the rate of water infiltration in the soil ( Horton (1933) Trans. Am. Geophys. Union 14 ; Kirkby (1988) J. Hydrol. 100 ). See also Vigiak et al. (2006) Geomorph. 76, 1–2...

overland flow

overland flow  

The flow of water over a hillslope surface. It may be laminar, turbulent, and transitional or consist of patches of any of these flow states (A. J. Parsons and A. D. Abrahams1992). Horton (1945) GSA ...
Hortonian overland flow

Hortonian overland flow  

An overland flow of water occurring more or less simultaneously over a drainage basin when rainfall intensity exceeds the rate of water infiltration in the soil (Horton (1933) Trans. Am. Geophys. ...
river flow

river flow  

The water that flows along a river, ultimately to the sea, as part of the water cycle. It includes water from overland flow, throughflow, interflow, soil pipes, percolation, and groundwater, as well ...
Overlander

Overlander  

Was the name given to settlers who drove stock over long distances to new pastures. The discovery of new territory for pastoral occupation sparked a steady flow of overlanders and ...
wash

wash  

1 A common form of slope erosion process, involving overland flow across a sloping surface.2 The usually dry channel of an intermittent or ephemeral stream in a semi‐arid area.
percoline

percoline  

A hollow at the base of a hillslope where water (soil moisture) seeps out onto the ground surface and becomes overland flow. Also known as a seepage line.
resistance

resistance  

In hydrology, the friction force counterbalancing the downslope gravitational force (L. B. Leopold et al. 1964). Resistance is a function of the surface area in contact with the flow, and so flow ...
detention storage

detention storage  

The temporary storage of surface water in low areas such as puddles, bogs, ponds, and wetlands, from which it evaporates or flows overland towards a stream channel. Also known as depression storage.
debris flow

debris flow  

Slow-moving, sediment gravity flow composed of large clasts supported and carried by a mud-water mixture. Debris flows occur as overland and submarine mudflows, and as submarine deep-sea deposits. ...
rainfall run-off

rainfall run-off  

The overland and downslope flow of rainwater into channelled flow when the rock or soil is saturated. In rainfall run-off modelling, hydrological models are categorized as lumped—which treat the ...
hillslope

hillslope  

The side or slope of a hill. Also known as hillside. See also colluvium.
surface runoff

surface runoff  

The flow across the land surface of water that accumulates on the surface when the rainfall rate exceeds the infiltration capacity of the soil. The rate of infiltration, and therefore the possibility ...
rainsplash

rainsplash  

The impact of raindrops on the soil may break down soil peds, loosen soil particles, and cause turbulence in the sheet wash of water flowing downslope. ‘Rainsplash…is not a single process, but a ...
hydrology

hydrology  

The study of the hydrologic (water) cycle. While it involves aspects of geology, oceanography, and meteorology, it emphasizes the study of bodies of sur-face water on land and how they change with ...
surface runoff

surface runoff   Quick reference

A Dictionary of Environment and Conservation (3 ed.)

Reference type:
Subject Reference
Current Version:
2017

...runoff Runoff that flows overland to a stream channel...

percoline

percoline   Quick reference

A Dictionary of Environment and Conservation (3 ed.)

Reference type:
Subject Reference
Current Version:
2017

... ( seepage line ) A hollow at the base of a hillslope where water ( soil moisture ) seeps out onto the ground surface and becomes overland flow...

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