As a weatherman in Oklahoma recently put it: "It is when a large rain and storm system hovers an area and does 'not leave' or 'move on' (as generally seen with systems) but instead stays, dumping supernatural amounts of water in a "flash," overwhelming even the more extraordinary and multi-competant drainage and levy systems."
Flash floods have a number of causes, but the primary one is when a very large amount of water is dumped suddenly in one region. This is usually the result of a storm cell. Flash floods are common in parts of Australia where the drainage systems are not used to handling sudden deluges.
Continuous rain in a river catchment can lead to that catchment becoming waterlogged, over-saturated with water to the point where it cannot take any more. In this instance, it takes only another 50mm (2 inches) or so of rainfall to trigger a flash flood.
Flash floods can be caused by:
The main factors that result in flash floods in deserts and semi deserts are;
- sudden, intense rain. Total rainfall amounts (measurements) do not have to be high, even storms of less than .5 inches can cause flash floods, if the rainfall is intense .
- topography. Areas that have high, barren mountains protruding from gently sloped, depositional plains provide conditions where a very high percentage of the rain that falls on the mountains and areas of higher elevation will take the easiest path possible (arroyos and washes) downhill, and without the topographical features of wetter climates (such as lakes, vegetation, topsoil, developed stream-beds) this flood water can arrive with little or no warning in places where there has been little or no rain.
-soil conditions. For a number of reasons, (primarily lack of vegetation and geology), desert soils have a very low capacity to hold water, so a very low percentage of the water that lands on them (rain) and runs across them (runoff) soaks into them. It is also the nature of many desert soils to be hydrophobic (water repellent). This is due to visible features (such as "desert pavement"), and microscopic features related to alkalinity and mineral (and in some cases organic) composition of the soil.
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2.cutting of trees
3.clogged canals
that's all thanks
Flash floods occur in low lying areas. They happen after heavy rains cause water accumulation, or cause rivers and streams to swell.suck coc
The flashflood is causeb by Heavy rain,Hurricane etc.Thanks I'm Dianne Nicole
Heavy rains.
1 in August 17 1998 flash flood and 1 in March 2011 flash flood
That would be called a flash flood.
Yes. Thunderstorms are the primary cause of flash floods.
flash floods
A flood is virtually any case of large mounts of water moving onto land. A hurricane is a tropical cyclone (i.e has a closed circulation of air) with sustained winds of at least 74 mph (119 km/h). Hurricane that hit land almost always cause flooding, but some hurricanes stay at sea and never threaten land.
flash flood wall
How big can a flash flood be?
In 2007 in July Glouctestershire was hit by flash flood (a flash flood is a flood that happened really quick due to lots of rain)
flash flood
No there is no flash flood.
Yes it was a flash flood. It was caused by very heavy rain over a long period of time. Also, you might want to know some of the causes. Causes: Tropical storms. 10% of land rivers or lakes Urbanisation. (When someone builds on top of a river or fooldplain.) Hope this helped. Xxx
1 in August 17 1998 flash flood and 1 in March 2011 flash flood
That would be called a flash flood.
A flood timberland is a flash flood. A flash flood is the rapid flowing of low-lying areas such as rivers, basins, and dry lakes.
Flash flood - A flash flood is a sudden inundation of water in low-lying areas, usually brought on by heavy rain or a dam break
Flash flood comes and goes really quick. A flood takes longer and takes longer to go away.
A Flash Flood of Colour was created on 2012-01-16.