A flash flood is a rapid flooding of low-lying areas: washes , rivers , dry lakes and depressions . It may be caused by heavy rain associated with a severe thunderstorm , hurricane , or tropical storm , or by meltwater from ice and snow . Flash floods may also occur after the collapse of a natural ice or debris dam , or a human structure such as a man-made dam , as occurred before the Johnstown Flood of 1889. Flash floods are distinguished from regular floods by having a timescale of fewer than six hours between rainfall and the onset of flooding.
22-536: Araluen may refer to: Places in Australia [ edit ] New South Wales Araluen, New South Wales , small town Northern Territory Araluen, Northern Territory , a suburb of Alice Springs Araluen Cultural Precinct , Alice Springs, which includes the Araluen Arts Centre Electoral division of Araluen , covering Alice Springs CBD,
44-468: A decline after a flash flood in 1860 virtually destroyed the town, killing 24 people. Another flash flood came in March 2012 killing one person. A 1874 account indicated the destructive impact: There was a revival of gold mining at Araluen in the first two decades of the 20th-century, when the area was extensively mined using gold dredges , adding to damage to the landscape of earlier mining efforts. By
66-604: A fictional place in the Ranger's Apprentice series of novels Araluen Zieria, common name of Zieria adenophora Topics referred to by the same term [REDACTED] This disambiguation page lists articles associated with the title Araluen . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Araluen&oldid=1222622582 " Category : Disambiguation pages Hidden categories: Short description
88-427: A storm that occurs on a mesa miles away. The flood sweeps through the canyon; the canyon makes it difficult to climb up and out of the way to avoid the flood. For example, a cloudburst in southern Utah on 14 September 2015 resulted in 20 flash flood fatalities, of which seven fatalities occurred at Zion National Park when hikers were trapped by floodwaters in a slot canyon. Flash floods induce severe impacts in both
110-447: A very short time. Second, these rains often fall on poorly absorbent and often clay-like soil, which greatly increases the amount of runoff that rivers and other water channels have to handle. These regions tend not to have the infrastructure that wetter regions have to divert water from structures and roads, such as storm drains, culverts, and retention basins , either because of sparse population or poverty, or because residents believe
132-590: Is different from Wikidata All article disambiguation pages All disambiguation pages Araluen, New South Wales Araluen is a small town near Braidwood in the Southern Tablelands of New South Wales , Australia , in Queanbeyan-Palerang Regional Council . It lies in the valley of Araluen Creek , that joins the Deua River at roughly the midpoint in its course. At
154-432: Is enough to carry away most SUV-sized vehicles. The U.S. National Weather Service reported in 2005 that, using a national 30-year average, more people die yearly in floods, 127 on average, than by lightning (73), tornadoes (65), or hurricanes (16). In deserts , flash floods can be particularly deadly for several reasons. First, storms in arid regions are infrequent, but they can deliver an enormous amount of water in
176-454: The 2021 census , Araluen had a population of 209 people. The area now known as Araluen lies on the traditional lands of Walbanga people, a group of Yuin . The name 'Araluen' meant 'water lily' or 'place of the water lilies' in the local Aboriginal language. At the time of European settlement Araluen was described as a broad alluvial valley with many natural billabongs covered with water lilies. Unfortunately, no such billabongs exist in
198-478: The Araluen valley today. The natural landscape of Araluen Creek and its valley were destroyed by rampant and extremely destructive alluvial gold mining during the 'gold rush' in the latter half of the 19th century. By 1852, gold was being mined on Araluen Creek, around what is now Araluen. There were several mining villages in the area. Araluen experienced a great population increase during the gold rush. It experienced
220-472: The U.S. National Weather Service (NWS) Storm Data datasets to connect the impact of flash floods with the physical processes involved in flash flooding. This should increase the reliability of flash flood impact forecasting models. Analysis of flash floods in the United States between 2006 and 2012 shows that injuries and fatalities are most likely in small, rural catchments, that the shortest events are also
242-648: The area are the Araluen gum ( Eucalyptus kartzoffiana ) and the Araluen zieria ( Zieria adenophora ). Media at Wikimedia Commons under Category: Araluen Flash flood Flash floods are a significant hazard, causing more fatalities in the U.S. in an average year than lightning, tornadoes , or hurricanes . They can also deposit large quantities of sediments on floodplains and destroy vegetation cover not adapted to frequent flood conditions. Flash floods most often occur in dry areas that have recently received precipitation , but they may be seen anywhere downstream from
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#1732845046953264-469: The built and the natural environment. The effects of flash floods can be catastrophic and show extensive diversity, ranging from damages in buildings and infrastructure to impacts on vegetation, human lives and livestock. The effects are particularly difficult to characterize in urban areas. Researchers have used datasets such as the Severe Hazards Analysis and Verification Experiment (SHAVE) and
286-439: The dangers of flash floods. What makes flash floods most dangerous is their sudden nature and fast-moving water. A vehicle provides little to no protection against being swept away; it may make people overconfident and less likely to avoid the flash flood. More than half of the fatalities attributed to flash floods are people swept away in vehicles when trying to cross flooded intersections. As little as 2 feet (0.61 m) of water
308-432: The flood effects are grouped into 4 categories: (i) impacts on built environment (ii) impacts on man-made mobile objects,(iii) impacts on the natural environment (including vegetation, agriculture, geomorphology, and pollution) and (iv) impacts on the human population (entrapments, injuries, fatalities). The scale was proposed as a tool on prevention planning, as the resulting maps offer insights on future impacts, highlighting
330-633: The high severity areas. Flash floods can cause rapid soil erosion. Much of the Nile delta sedimentation may come from flash flooding in the desert areas that drain into the Nile River . However, flash floods of short duration produce relatively little bedrock erosion or channel widening, having their greatest impact from sedimentation on the floodplain. Some wetlands plants, such as certain varieties of rice, are adapted to endure flash flooding. However, plants that thrive in drier areas can be harmed by flooding, as
352-706: The mid-1920s, dredging had ended. Over its years as a goldfield, Araluen produced in excess of £11,000,000 worth of gold. After the years of gold mining, Araluen was renowned for its stone fruit , particularly its large, good tasting peaches . It had various schools between 1867 and 1956. Araluen West Public School operated from 1867 to 1919, although it was called Bourketown Public School during its first two years. Araluen Upper Public School operated from 1872 to 1888. Araluen Lower Provisional School operated from 1943 to 1956. Araluen West Evening Public School operated from 1880 to 1886 and in 1890 and 1892. Araluen Evening Public School operated in 1880 and 1881. The town
374-414: The most dangerous, that the hazards are greatest after nightfall, and that a very high fraction of injuries and fatalities involve vehicles. An impact severity scale is proposed in 2020 providing a coherent overview of the flash flood effects through the classification of impact types and severity and mapping their spatial extent in a continuous way across the floodplain. Depending on the affected elements,
396-567: The risk of flash floods is not high enough to justify the expense. In fact, in some areas, desert roads frequently cross a dry river and creek beds without bridges. From the driver's perspective, there may be clear weather, when a river unexpectedly forms ahead of or around the vehicle in a matter of seconds. Finally, the lack of regular rain to clear water channels may cause flash floods in deserts to be headed by large amounts of debris, such as rocks, branches, and logs. Deep slot canyons can be especially dangerous to hikers as they may be flooded by
418-606: The source of the precipitation, even many miles from the source. In areas on or near volcanoes , flash floods have also occurred after eruptions, when glaciers have been melted by the intense heat. Flash floods are known to occur in the highest mountain ranges of the United States and are also common in the arid plains of the Southwestern United States. Flash flooding can also be caused by extensive rainfall released by hurricanes and other tropical storms , as well as
440-421: The suburb of Araluen, and some rural areas Queensland Araluen, Queensland , a suburb of Gympie Western Australia Araluen Botanic Park Araluen Pumpback Dam Araluen-Wungong Important Bird Area People [ edit ] Evelyn Araluen , Indigenous Australian poet Other uses [ edit ] Araluen Gum, common name of Eucalyptus kartzoffiana Araluen Kingdom,
462-442: The sudden thawing effect of ice dams . Human activities can also cause flash floods to occur. When dams fail , a large quantity of water can be released and destroy everything in its path. The United States National Weather Service gives the advice "Turn Around, Don't Drown" for flash floods; that is, it recommends that people get out of the area of a flash flood, rather than trying to cross it. Many people tend to underestimate
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#1732845046953484-601: Was connected by road to Braidwood , via Majors Creek , from its earliest days. Those travelling from the coast went via Braidwood, either over the Clyde Road (from Nelligen on the Clyde River ) or the Braidwood Road (from Nowra ). From around 1858, packhorses were used to bring supplies from the coastal river town of Moruya . In 1867–1868, a road—Araluen Road—was built from Araluen to Moruya. Two rare plants growing in
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