description of a flood

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November 29th, 2020

Defenses such as detention basins, levees,[29] bunds, reservoirs, and weirs are used to prevent waterways from overflowing their banks. So-called flash floods can be extremely dangerous, instantly turning a babbling brook or even a dry wash into rushing rapids that sweep everything in their path downstream. A flood is a general and temporary condition where two or more acres of normally dry land or two or more properties are inundated by water or mudflow. Flood waters provide much needed water resources in arid and semi-arid regions where precipitation can be very unevenly distributed throughout the year and kills pests in the farming land. Convective precipitation events (thunderstorms) tend to produce shorter duration storm events than orographic precipitation. The first is the main channel of the river itself, called the floodway. An extreme river flood is called a flash flood, which carries water ranging from 10 to 20 feet high. Floods don’t occur randomly. General Description of the Flood. According to the U.S. National Weather Service (NWS) Northeast River Forecast Center (RFC) in Taunton, Massachusetts, a rule of thumb for flood forecasting in urban areas is that it takes at least 1 inch (25 mm) of rainfall in around an hour's time in order to start significant ponding of water on impermeable surfaces. Extreme flood events often result from coincidence such as unusually intense, warm rainfall melting heavy snow pack, producing channel obstructions from floating ice, and releasing small impoundments like beaver dams. The legend of the flood –better said the narrative— recounts the God’s intent to bring Earth back to its pre-creation state. Indoor Air Quality (IAQ) Scientific Findings Resource Bank (IAQ-SFRB), Center for Neighborhood Technology, Chicago IL. Conversely, given the observed inundation area of a recent flood and the channel conditions, a model can calculate the flow rate. Floods occur in all types of river and stream channels, from the smallest ephemeral streams in humid zones to normally-dry channels in arid climates to the world's largest rivers. A flood is an overflow of water that submerges land that is usually dry. Excessive rain, a ruptured dam or levee, rapid melting of snow or ice, or even an unfortunately placed beaver dam can overwhelm a river, spreading over the adjacent land, called a floodplain. Floods (in particular more frequent or smaller floods) can also bring many benefits, such as recharging ground water, making soil more fertile and increasing nutrients in some soils. Flood recurrence intervals can range from multiple times a year to once in 10 years or even 30 years. Lack of clean water combined with human sewage in the flood waters raises the risk of waterborne diseases, which can include typhoid, giardia, cryptosporidium, cholera and many other diseases depending upon the location of the flood. As a result, the rising limb of the hydrograph becomes ever quicker as the flood moves downstream, until the flow rate is so great that the depletion by wetting soil becomes insignificant. All rights reserved. The Kerala flood in India was another flood that has destroyed people's houses. The increase in flow may be the result of sustained rainfall, rapid snow melt, monsoons, or tropical cyclones. Introduction. While riverine floods can affect many a cities on its way. Bird populations may also profit from the boost in food production caused by flooding.[24]. Meanwhile, melting glaciers and other factors are contributing to a rise in sea levels that has created long-term, chronic flooding risks for places ranging from Venice, Italy to the Marshall Islands. Edzo 2 / 2 . According to Wikipedia, A flood is an overflow of water that submerges land which is usually dry. The water and landscape can be contaminated with hazardous materials such as sharp debris, pesticides, fuel, and untreated sewage. A series of storms bringing massive amounts of rain is the most common cause of flooding, but there are others. WMO/GWP Associated Programme on Flood Management, Dyhouse, G., "Flood modelling Using HEC-RAS (First Edition)", Haestad Press, Waterbury (USA) 2003. The Noachian Flood account is a foundation stone of the Bible, since many Bible writers refer to the Flood as a historical event. [10], Most precipitation records are based on a measured depth of water received within a fixed time interval. Areal flooding begins in flat areas like floodplains and in local depressions not connected to a stream channel, because the velocity of overland flow depends on the surface slope. [13] The critical duration of intense rainfall might be only a few minutes for roof and parking lot drainage structures, while cumulative rainfall over several days would be critical for river basins.

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