A large amount or number, especially when moving from one place to. These below street level channels are normally empty so that they. Overflow of inland or tidal waters unusual or rapid accumulation or runoff of surface waters from any source what is a flood. Flood magnitude depends on precipitation intensity, volume, timing and phase, from the antecedent conditions of rivers and the drainage basins. If there is a flood, a large amount of water covers an area which is usually dry, for.
Def 1 may 1, 2011 this list of terms is intended to include those that have specific meaning to the national flood insurance program nfip. Flooding happens in many ways due to overflow of streams, rivers, lakes or oceans or as a result of excessive rain. Pdf recent floods and consequences all over the world are becoming too frequent and threat to sustainable. Time and again, preparedness has been regarded as one of the most important values a person can have. Thresholds and criteria of the definition of rising rivers. In a few instances, standard industry terms have been added for additional focus and emphasis. The depth shown on the flood insurance rate map firm for zone ao that indicates the depth of water above highest adjacent grade resulting from a flood that has a 1 percent chance of equaling or exceeding that level in any. Hence, a useful definition of flood can be formulated thus. Therefore the responsible authorities should provide timely and reliable flood warning, flood. A flood is caused by a combination of heavy rainfall causing river oceans to over. Prfa is extensive geographically and in terms of the flooding mechanisms. It is known that the hydrosphere participates in continuous water exchange between the.
Insurance council welcomes standard definition of flood. When monetized, flood risk can be used to determine the economically optimal safety level. Flood risk flood risk takes into account the overall consequences of a flood. Flood risk assessment caused by triggering factors which initiate the hazard occurrence or in. The authors views expressed in this document do not necessarily reflect the views of the united states agency for international development or the united. A flash flood is a term we use to describe a flood that happens very quickly in lowlying land, and its usually caused by very heavy rains. Flood and flash flood definitions national weather service. Flood causes and prevention flood specialist blog by flood. An existing flood determination can be relied upon in certain circumstances if the determination is less than seven years old, the flood map and flood status havent changed, and it was prepared on the standard flood hazard determination form. In the sense of flowing water, the word may also be applied to the inflow of the tide. Being prepared and being ready has been the central principle of countless organizations, from scouting groups, public services, to heads of states. A flood is caused by a combination of heavy rainfall causing river oceans to over flow their banks, and can. The a zones may or may not be reflective of flood profiles, depending on the availability of data for a given area. In simple terms, flood can be defined as an overflow of large quantities of water onto a normally dry land.
Chapter 4 flood risk assessment chapter overview any floodplain management program must be established on a sound technical and scientific basis in order to be effective, whether for flood loss reduction or to manage natural resources, or both. Flooding is a longer term event than flash flooding. These zones are depicted on a communitys flood insurance rate map firm or flood hazard boundary map. A flood is a natural event that can have far reaching effects on people and the environment. Storm surge should not be confused with storm tide, which is defined as the water level. A zones those areas shown on the official floodplain zoning map which would be inundated by the regional flood. A flood having a 1 percent chance of being equaled or exceeded in any given year. Put simply, a flood is too much water in the wrong place. An overflowing of water onto land that is normally. Flooding is often thought of as a result of heavy rainfall, but floods can arise in a number of. Flood definition and meaning collins english dictionary. A 1% safety level means that the probability that a flood will occur within a given year is 1%. That is why flood hazard and risk assessment exercises are often broken down into two stages.
An overflowing of water onto land that is normally dry. Pack a rucksack with important items just in case you need to move out. On the other hand, streams in hilly areas may give no warning that a flash flood is about to strike. Flood definition is a rising and overflowing of a body of water especially onto normally dry land.
X, c areas of minimal flood hazard from the principal source of flood in the area and determined to be outside the 0. Zone x is used on new and revised maps in place of zone c. A flood of such magnitude that it might be expected to occur only once in 100 years is called a 100year flood. Nfip definition of flood general and temporary condition partial or complete inundation, such as.
Information and translations of flood in the most comprehensive dictionary definitions resource on the web. Designed to prevent flooding by channelling flood waters away from jeddah. However, it does not indicate how severe this flood will be if it occurs. These zones are depicted on a communitys flood insurance rate map firm. Insurance council ceo rob whelan said the regulations followed almost 18 months of discussions with the federal government. Flash floods can be caused by a number of things, but is most often due to extremely heavy rainfall from thunderstorms.
Definitions of fema flood zone designations flood zones are geographic areas that the fema has defined according to varying levels of flood risk. The a zone is the area subject to inundation during a 100year flood, which is the flood elevation that has a 1percent chance of being equaled or exceeded each year. If ht is a totally random process, the hazard events can be described by a theoretical probability density function. The a zone is the area subject to inundation during a 100year flood, which. Insurance council welcomes standard definition of flood the insurance council of australia today welcomed the enactment of regulations that introduce a standard definition of flood to insurance contracts. Flood definition, a great flowing or overflowing of water, especially over land not usually submerged. The original emergency managementrelated terms and definitions guide was developed as. Jan 15, 2020 flood insurance is a type of property insurance that covers a dwelling for losses sustained by water damage specifically due to flooding caused by heavy or prolonged rain, melting snow, coastal. Pdf an assesment of causes and effects of flood in nigeria. Flood insurance is a type of property insurance that covers a dwelling for losses sustained by water damage specifically due to flooding caused by heavy or prolonged rain, melting snow, coastal. Flood is a shortterm or seasonal inundation of earths dry land areas by water from any source and due to action of different forces and under the influence of various factors. The main cause of flooding in the city centre is the use of flood barriers beyond the city centre. The magnitudes of 100, 500, and 1,000year floods are calculated by extrapolating existing records of stream flow, and the results are used in the design engineering of many water resources projects, including dams and reservoirs, and other structures that may be affected by.
Waterflood definition of waterflood by merriamwebster. Flood causes and prevention flood specialist blog by. The effects of floods on human wellbeing range from unqualified blessings to catastrophes. Floods are an area of study of the discipline hydrology and are of significant concern in agriculture, civil engineering and public health. Flood zone definitions zone a zone ah zone ao zone ae zone v zone ve zone x zone xs zone d everyone lives in a flood zone. The inundation of a normally dry area caused by rising water in an existing waterway, such as a river, stream, or drainage ditch. Its effectiveness depends on the level of preparedness and correct response. Flood definition in the cambridge english dictionary. In flood definition is close to overflowing its banks and flooding the land next to it. Find your zone using the hawaii flood hazard assessment tool areas subject to inundation by the 1. Flood control definition and meaning collins english dictionary. Flood control definition and meaning collins english. Nonetheless, even a small increase in the peak discharge of a large flood can increase flood damages. We dont know whether the bridge can cope with that amount of water during a flood and it could eventually collapse, he said.
Flood control definition, the act or technique of controlling river flow with dams, dikes, artificial channels, etc. Luzon however will still have fair weather so staying at home should be easy. On a global basis, there is evidence that the number of people affected and economic damages resulting from flooding are on the rise at an alarming rate. A flood is an overflow of water that submerges land that is usually dry. Each zone reflects the severity or type of flooding in the area. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Flash floods can occur due to dam or levee breaks, andor mudslides debris flow. Pdf flood impact is one of the most significant disasters in the world. The depth shown on the flood insurance rate map firm for zone ao that indicates the depth of water above highest adjacent grade resulting from a flood that has a 1 percent chance of equaling or exceeding that level in any given year. Flood channels are yet another way that humans have tried to prevent flooding. Pdf an introduction to flood risk and management researchgate.
X shaded, x500, b areas of moderate flood hazard from the principal source of flood in the area. Waterflood definition is the process of waterflooding an oil well. A flood is defined as water overflowing onto land that usually is dry. The definition of risk receptors is also a political decision and a discussion. Flood is commonly defined as an overflow of water onto lands that are used or are usable by man, and are not normally covered by water. Flooding problems resulting from runoff of surface water generally increase as. Dont forget to include sentimental personal belongings such as. Generally, the larger the river, the deeper the flood and the longer it will last. Flood zones are geographic areas that fema has defined according to varying levels of flood risk. Best practices on flood prevention, protection and mitigation 3 flood forecasting and warning is a prerequisite for successful mitigation of flood damage.
By definition, any land which is usually above water level is said to be flooded if it goes under water for a period arbitrarily defined as one or two hours. Flood, highwater stage in which water overflows its natural or artificial banks onto normally dry land, such as a river inundating its floodplain. Ponding of water at or near the point where the rain fell. In flood definition of in flood by the free dictionary. For more information on the fema flood insurance program, visit the fema website at.
More than half of global flood damages occur in asia. Flooding that begins within 6 hours, and often within 3 hours, of the heavy rainfall or other cause. Chapter 2 types of floods and floodplains fema training. Conditions on a river that drains a large watershed may warn of a pending flood hours or even days before actual flooding.
214 717 849 508 263 196 577 302 1133 1060 471 304 501 898 696 151 1048 608 905 1043 1325 1169 595 653 1225 607 539 870 863 628 264 1104 740 1053