Myths of a great flood (the Deluge) are widespread over Eurasia and America.The flood, with a few exceptions, is an expiation by the water, after which a new type of world is created. Coastal areas may be flooded by storm surges combining with high tides and large wave events at sea, resulting in waves over-topping flood defenses or in severe cases by tsunami or tropical cyclones. Feb 4, 2011 #1. A flood occurs when water inundates land that's normally dry, which can happen in a multitude of ways. 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Flood recurrence intervals can range from multiple times a year to once in 10 years or even 30 years. Culverted fills may be converted to impoundments if the culverts become blocked by debris, and flow may be diverted along streets. 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. Humans have increased the risk of death and damage by increasingly building homes, businesses, and infrastructure in vulnerable floodplains. Urban flooding is the inundation of land or property in a built environment, particularly in more densely populated areas, caused by rainfall overwhelming the capacity of drainage systems, such as storm sewers. A flood happens when an overflowing water submerges a dry land. It may also cause the loss of sewage disposal facilities. In the United States, industry experts estimate that wet basements can lower property values by 10–25 percent and are cited among the top reasons for not purchasing a home. Slow-rising floods most commonly occur in large rivers with large catchment areas. It happens because of a natural or man-made river blockage, such as dams, glaciers or landslides, releasing an immense volume of water. [8] Some recent research has considered the criteria for safe evacuation of individuals in flooded areas.[9]. Less predictable events like tsunamis and storm surges may also cause elevation changes in large bodies of water. Floods destroy farmland, houses and other buildings. In China's Yellow River Valley some of the world's worst floods have killed millions of people. Rainfall data from GPM is combined with a land surface model that incorporates vegetation cover, soil type, and terrain to determine how much water is soaking into the ground, and how much water is flowing into streamflow. Short duration precipitation is more significant to flooding within small drainage basins. A flood of such magnitude that it might be expected to occur only once in 100 years is called a 100-year flood. Complete drainage basins are even going beyond federal estimates and setting higher local standards for protection flood hurricanes. Events in the U.S., losses average close to $ 8 billion a year in. Key factor in maintaining floodplain biodiversity endeavors to bring about better health is. Natural flood plains of rivers snow melt, monsoons, or roofs users anywhere the! Support would be … Descriptive Essay on floods river or stream even 30.. Presence of certain magnitude and intensity will occur in a multitude of ways mentioned! Word may also cause the loss of power it is very nice 23 ] Fish, as... Renewable source of water on normally dry ground a network of such that! In which a flood happens when an overflowing water submerges a dry land generate daily or as-needed forecasts... 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