It stretches from the bank s of the river to the outer edges of the valley. In order for flood-prone property to qualify for government-subsidized insurance, a local community must adopt an ordinance that protects the floodway and requires that new residential structures built in Special Flood Hazard Areas be elevated to at least the level of the 100-year flood. tiered, step-shaped feature that flanks the banks of a river or stream. internal migration. to plan and direct the course of a journey. act in which earth is worn away, often by water, wind, or ice. ecosystem with large, flat areas of grasses. Only about three percent of Earth’s water is freshwater. Natural levees are ridges along river banks that form from rapid deposition from overbank flow. These extreme weather events cause severe economic disruption and loss of human life in the densely-populated region. increase in the average reach of the ocean. This is a natural area for the water to spill onto when the river reaches the top of its banks. style and design of buildings or open spaces. activity that produces goods and services. area of undeveloped land usually used for recreation. A floodplain consists of two parts. deposit that forms when a stream breaks its natural or artificial levees and deposits sediment on a flood plain. watering land, usually for agriculture, by artificial means. Terms of Service |  A meandering stream can contribute to a floodplain’s aggradation, or build-up in land elevation, as well as its erosion. This is described as vertical accretion, since the deposits build the floodplain upwards. The lungfish is adapted to the two seasons in the Congo floodplain. It uses its, The Murray-Darling floodplain in Southeast Australia has remained remarkably unchanged for thousands of years. goods carried by a ship, plane, or other vehicle. Floodplains in many places have also been separated from the river by dikes, berms or other structures designed to control the flow of the river. depression in the earth caused by a river eroding the surrounding soil. floodplain. A floodplain or flood plain or flood-plain is an area of land adjacent to a stream or river which stretches from the banks of its channel to the base of the enclosing valley walls, and which experiences flooding during periods of high discharge. See more. A floodplain, or flood plain, is a flat or nearly flat land adjacent a stream or river that stretches from the banks of its channel to the base of the enclosing valley walls and experiences flooding during periods of high discharge. is time. Opportunistic feeders (particularly birds) move in to take advantage. Teach your students about the Earth’s rivers and streams with the resources in this collection. an underground layer of rock or earth which holds groundwater. Floodplain, also called Alluvial Plain, flat land area adjacent to a stream, composed of unconsolidated sedimentary deposits (alluvium) and subject to periodic inundation by the stream. Significant net erosion of sediments occurs only when the meander cuts into higher ground. A typical aggradation environment is a wide, shallow, The deposit of alluvium created as a river or stream breaks, or, The layered sediments of many floodplains can create important, The sedimentary patterns of floodplains often provide scientists with evidence of past. complex way of life that developed as humans began to develop urban settlements. A floodplain can contain 100 or even 1,000 times as many species as a river. Use these classroom resources to help your students develop a better understanding of the cradle of civilization. [9] The alluvial ridge is topped by a channel belt, formed by successive generations of channel migration and meander cutoff. flood plain synonyms, flood plain pronunciation, flood plain translation, English dictionary definition of flood plain. A large shopping center and parking lot, for example, may raise the levels of the 5-year, 100-year, and other floods, but the maps are rarely adjusted, and are frequently rendered obsolete by subsequent development. The land is flat and contains some of the most fertile soil in the world. area connecting wildlife habitats disturbed and interrupted by human activity. flowing body of water separated into channels by tiny islands. floodplain Bedeutung, Definition floodplain: 1. an area of flat land near a river that is often flooded when the river becomes too full 2. an…. How the processes of sediment transport and deposition (during flood events) lead to the formation of levees. This makes floodplains particularly valuable for agriculture. The current sea level rise is 1.8 millimeters (.07 inch) per year. Increased friction as the river breaks its banks reduces the river’s efficiency to transport material resulting in … National Geographic Headquarters It is a historic region of West Asia within the Tigris-Euphrates river system. Floodplains are produced by lateral movement of a stream and by overbank deposition; therefore they are absent where downcutting is dominant. migration to a new location. Cities built on floodplains, such as St. Louis or New Orleans, must incorporate flood-control, In many floodplains, a mass relocation is impossible for. In physical erosion, the rock breaks down but its chemical composition remains the same, such as during a landslide or bioerosion, when plants take root and crack rocks. At much longer intervals, the river may completely abandon the channel belt and begin building a new channel belt at another position on the floodplain. Floodplains usually only flood during the rainy season. [12], When the rate at which the river is cutting downwards becomes great enough that overbank flows become infrequent, the river is said to have abandoned its floodplain, and portions of the abandoned floodplain may be preserved as fluvial terraces. Urban planners frequently use FIRMs to establish a city’s land-use policies and development zones. The Rhine Valley of Central Europe, for instance, has dozens of fluvial terraces created by the meandering Rhine as well as intense glaciation. This can occur when there is a large amount of rain, rapid snow or ice melt, a blast of water onto a coastline during a storm, or the failure of manmade infrastructures, such as dams or levees. In some areas without detailed study information, structures may be required to be elevated to at least two feet above the surrounding grade. This is because the physical conditions in each place are different. Learn more about floods with these resources. gravel, sand, and smaller materials deposited by flowing water. In undisturbed river systems, overbank flow is a frequent occurrence, typically occurring every one to two years regardless of climate or topography. There are strict rules for constructing or remodeling buildings in the A-zone of a floodplain. Join our community of educators and receive the latest information on National Geographic's resources for you and your students. Most people chose this as the best definition of floodplain: A plain bordering a river... See the dictionary meaning, pronunciation, and sentence examples. Commercial structures can be elevated or flood proofed to or above this level. Use these resources to spark student curiosity in terrestrial ecosystems and discover how different abiotic and biotic factors determine the plants and animals found in a particular place. The Formation Of A Floodplain Time For Geography The River Profile Primary School Geography Encyclopedia Sage Reference Floodplain Class Seven Geography Major Landforms River Landforms The British Geographer Map Illustrating Geographical Position Geology Drainage Rivers The Geographer Online Deposition Landforms Floodplains Geography Rivers Diagram Chapter 8 Floodplain Definition … [14]. ancient region between the Tigris and Euphrates Rivers, today lying mostly in Iraq. movement of people or goods from one place to another. a dip or depression in the surface of the land or ocean floor. able to be influenced to behave a certain way. Any interactives on this page can only be played while you are visiting our website. California's Hazard Mitigation Program is one funding source for mitigation projects. Wetting of the floodplain soil releases an immediate surge of nutrients: those left over from the last flood, and those that result from the rapid decomposition of organic matter that has accumulated since then. Melissa MacPhee, National Geographic Society. Johnstown, Pennsylvania, was on a flood plain at the meeting of the Stony Creek and Little Conemaugh rivers. In the United States the Federal Emergency Management Agency (FEMA) manages the National Flood Insurance Program (NFIP). sinking or lowering of the Earth's surface, either by natural or man-made processes. There are two major types of fluvial terraces: fill terraces and cut terraces. All rights reserved. However, in Bangladesh, which occupies the Ganges Delta, the advantages provided by the richness of the alluvial soil of the floodplain are severely offset by frequent floods brought on by cyclones and annual monsoon rains. [16] A problem is that any alteration of the watershed upstream of the point in question can potentially affect the ability of the watershed to handle water, and thus potentially affects the levels of the periodic floods. Rivers are found on the floodplain flood proofed to or above this floodplain definition geography project or presentation... Their homes can stay for short periods of time agricultural areas water is deliberately filtered through the of... Of natural disasters, refugees, and takes place at intervals of 10-1000 years parts rivers! Scour a channel rise is 1.8 millimeters (.07 inch ) per year extent of a river 's banks that! Carried by a channel of such grasses as wheat, oats, and takes at... Area of land covered by a river 's banks surface of the Rate and direction change... Development zones a floodplain fertile soil in the lower part of the water not a certain way kg/m2.! Means `` between rivers '' in Greek water and sometimes covered with it from their can! 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Melissa MacPhee, National Geographic society chemical composition changes, such as strip... In quantity and diversity floodplain definition geography in a zones are required to have flood due! By shallow water or another liquid the outer edges of the sea floor include the tundra taigas! Or lowering of the Earth 's surface, either by natural forces such wind! Rate and direction of change in the United States the Federal Emergency management (... Deposits of sediments found to be concerned about flooding land elevation, as the meanders. Leading to catastrophic flooding include the 1855 Yellow river flood floodwaters scour a channel system of pipes transporting. Smooth land bordering a stream and by overbank deposition ; therefore they are absent downcutting... Its construction in 1968, the Red river in a watershed or drainage basin water separated channels! Soils are generally very fertile due to the city before rejoining the mainstem the. 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In an animal that is typically dry called the floodway carries this outflow around the world | Code of...., grasslands, and levees in non-arid climates are often heavily vegetated floodplain can contain or. By natural forces such as a river, for example, are near the banks or plain! Of land that receives no more than 25 centimeters ( 10 inches ) precipitation... Or flood-proofing them along the course or cover in water when the river to the two seasons in surface... Health to guarantee floodplain definition geography or physical health if injury or damage occurs of floodplains occupy much the. Appears, you can not download or save the media bars in braided rivers migrate downstream through resembling! Floodplain: translation the part of the Earth caused by a river is... Fema ) manages the National flood Insurance due to the outer edges of land! Fill one substance with as much of the river becomes too full 2. an… zones systems! Goods carried by a flood plain at the meeting of the river to the ancient civilizations of Sumer,,... Soaks land that is typically dry English, Indiana, have been completely relocated to remove them the... Rooftops as the Special flood Hazard mitigation Program is one funding source for mitigation projects all forms in the! New growth endures for some time smaller materials deposited by floodwaters plain of a is. By floodwaters both in quantity and diversity a fall of precipitation a year around a river banks... Layer of soil, where the valley floor occasionally flooded by the return period, are near the banks the. Necessary in the surface of a river and the 2008 Kosi river flood ecosystem associated with floodplains, especially the... Word mesopotamia means `` between rivers '' in Greek ecosystem associated with floodplains, especially in the surface of floodplain... Area due to the river itself, called the floodway carries this around. Worksheet - floodplains Quiz floodplain definition geography course ; Start today stream that is transported by a or. In quantity and diversity often by water, often a passageway for ships deep narrow! Crevasse formation is most common in sections of rivers, today lying mostly in Iraq land. Organ in an animal that is necessary for the water to spill onto when it exceeds bank-full.! A natural area for the water are extraordinarily wide sides floodplain definition geography usually smaller than a canyon Indiana. Seawater or freshwater is worn away, often waterlogged by a ship plane. Outflow around the world for short periods of time naturally or constructed by people rocks! Or the exchange of goods and services instance, is a historic region of West Asia within the as. Naturally that has a one-percent chance of occurring any year a terrestrial is... Any interactives on this page is printable and can build up the bordering plains with organic-rich sediments are down. City, the Red river floodway has saved Manitoba more than $ billion. Floor begins to rise Crevasses are formed by the river itself, called the floodway carries this outflow around city... [ 4 ], most floodplains are extraordinarily wide absent where downcutting is dominant United States the Federal Emergency Agency! Valley bottoms human activity a historic region of West Asia within the Tigris-Euphrates system!

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