Types Of Floods And Their Causes Pdf

File Name: types of floods and their causes .zip
Size: 2149Kb
Published: 03.06.2021

Floods impact on both individuals and communities, and have social, economic, and environmental consequences. The consequences of floods, both negative and positive, vary greatly depending on the location and extent of flooding, and the vulnerability and value of the natural and constructed environments they affect. The consequences of floods, both negative and positive, vary greatly depending on their location, duration, depth and speed, as well as the vulnerability and value of the affected natural and constructed environments.

Every year floods cause enormous damage all over the world. This study investigates loss of human life statistics for different types of floods and different regions on a global scale. Information from this source on a large number of flood events, which occurred between January and June , is evaluated with respect to flood location and flood type. Due to the limited availability of information on coastal flood events, the scope of this study is limited to three types of freshwater flooding: river floods, flash floods and drainage problems.

Flooding 101

Believe it or not, flooding is the deadliest type of severe weather. Use the buttons below to jump to the flood facts you care about the most, or read the entire Flooding guide to become an expert! Flood Facts. Worst Floods. Download a PDF version of the guide you can reference later.

A flood is an overflow of water that submerges land that is usually dry. Floods are an area of study in the discipline of hydrology. They are the most common and widespread natural severe weather event.

Floods can look very different because flooding covers anything from a few inches of water to several feet. They can also come on quickly or build gradually. According to our friends at the National Severe Storms Laboratory , there are five types of floods. They include:. River Flood. Coastal Flood. Storm Surge. Inland Flooding.

Flash Flood. As you can infer from the list above, flooding can happen anywhere, including both coastal and inland locations. A river flood occurs when water levels rise over the top of river banks. This flooding can happen in all river and stream channels. Causes of River Flooding. River flooding typically happens for four reasons. They are:. Excessive rain from tropical storm systems making landfall.

Persistent thunderstorms over the same area for extended periods. Combined rainfall and snowmelt. Ice jam. More on Riverine Floods. River floods can happen suddenly or slowly. Sudden river flooding events occur more often on smaller rivers, rivers with steep valleys, rivers that flow for much of their length over impermeable terrain, and normally dry channels.

On the other hand, low-rising river floods typically occur in large rivers with large catchment areas. What is Coastal Flooding? A coastal flood is the inundation of normally dry land areas along the coast with seawater. Causes of Coastal Flooding. Coastal flooding is typically a result of a combination of sea tidal surges, high winds, and barometric pressure.

These conditions typically come from storms at sea like:. Tropical cyclones. Higher-than-average tides. Another type of flooding that is often associated with coastal flooding is storm surge. What is Storm Surge?

Storm surge is an abnormal rise in water level in coastal areas over and above the regular astronomical tide. Causes of Storm Surge. Storm surge is always a result meteorological storms that cause higher than normal tides on the coast. There are three parts of a storm that create this surge. Low atmospheric pressure. Learn about storm surge from one of our expert meteorologists, Andrew Rosenthal in the below snippet from our weather safety warmup webinar on hurricanes :.

Storm surge is an extremely dangerous form of flooding. It can flood large coastal areas at the same time.

Extreme flooding occurs when storm surge happens at the same time as high tide. This can cause storm tides to reach over 2o feet! Our meteorologists always stress that storm surge is the most dangerous aspect of any tropical system. It poses the most threat to both life and property. For example, storm surge took the lives directly and indirectly of over 1, people during Hurricane Katrina. Some organizations refer to inland flooding as urban flooding. A flash flood is also a type of inland flood.

What is an Inland Flood? An inland flood is flooding that occurs inland or not in a coastal area. Therefore, coastal flooding and storm surge are not inland floods. Causes of Inland Flooding. Rainfall is almost always to blame for inland floods. Rain causes inland flooding in two ways. It can happen with steady rainfall over several days or it can happen because of a short and intense period of rainfall. Snowmelt also causes inland floods, although rainfall is a more common cause.

Another way inland flooding happens is when water ways get blocked by debris, ice, or dams. More on Inland Floods. The following urban features can create urban flooding or make inland floods worse:. Paved roads and streets. Low-capacity drainage equipment. Dense buildings. Low amounts of green space. The most well-known and deadly type of flood is a flash flood.

What is a Flash Flood? A flash flood is flooding that begins within 6 hours, and often within 3 hours, of heavy rainfall or other cause. What Causes Flash Floods? There are two key elements to determine is flash flooding is likely:. Rainfall rate. Rainfall duration. Flash floods also happen when damns break, when levees fail, or when an ice jam releases a large amount of water. Dangers of Flash Floods. Flash flooding is the 1 severe weather killer in the United States.

They have enough force to roll boulders, tear trees from the ground, destroy buildings and bridges, and scour out new channels. With heights reaching 30 feet, flash floods can completely cover communities. This is especially true when dams or levees break. They also recommend having a family or business disaster plan ready in the case of a flash flood.

If you read through the above section on types of floods, you might just want to skip down to flooding effects. As we mentioned above, there are plenty of different causes of flooding.

While different flood types typically have different causes, most floods are caused by one of the following activities. Heavy rainfall is the simplest cause of flooding. This can result in floods like flash flooding. Overflowing rivers are another cause of floods. As we mentioned before, river flooding can happen when there is debris in the river or dams that block the flow of the water.

Older infrastructure can fail when heavy rains come and water levels rise. When dams break, they unleash torrents of water on unsuspecting households.

This is part of what happened when Hurricane Katrina hit New Orleans in Storm surge and tsunamis also cause flooding. Storm surges from hurricanes and other tropical systems can cause sea levels to rise and cover normally dry coastal areas in several feet of water.

As these waves move inland, they build height and can push a lot of water inland in coastal areas. Flooding often occurs when there is fast runoff into lakes, rivers, and other basins. This is often the case with rivers and other channels that feature steep sides.

Global Perspectives on Loss of Human Life Caused by Floods

To browse Academia. Skip to main content. By using our site, you agree to our collection of information through the use of cookies. To learn more, view our Privacy Policy. Log In Sign Up. Download Free PDF.

What are the consequences of floods?

Other methods include levees, dikes, dams, retention or detention basins. Communities preferred improvement of drainage structures with detention basins near the sites. Floods are caused by many factors: heavy precipitation, severe winds over water, unusual high tides, tsunamis, or failure of dams, levels, retention ponds, or other structures that contained the water. During times of rain or snow, some of the water is retained in ponds or soil, some is absorbed by grass and vegetation, some evaporates, and the rest travels over the land as surface runoff. Floods occur when ponds, lakes, riverbeds, soil, and vegetation cannot absorb all the water.

The Causes of Floods

Feb 09 Read

One of the keys to understanding flood risk is understanding the nuances of the type or types of flood you face. There are several different kinds of flood, and each one bears a different impact in terms of how it occurs, the damage it causes, and how it is forecasted. A coastal flood, as the name suggests, occurs in areas that lie on the coast of a sea, ocean, or other large body of open water.

Sridhar and A. Minor flooding This causes inconveniences such as closure of minor roads or low lying land. Hanspeter Stamm. This is because flooding can carry bridges, cars, houses, and even people.

What are the Different Types of Floods?

Since floods can damage any property in almost any area, it is important to learn about the various types of floods and how they can affect properties. They are caused by heavy rainfall or rapid snow thaw. Floods usually cover a relatively small area and occur with little to no notice, generally less than six hours.

В трубке повисло молчание. - Мидж… - Джабба попробовал извиниться.  - Позволь мне объяснить.  - Голос его, однако, мягче не .

 - Не судьба. Собор закрыт до утренней мессы. - Тогда в другой.  - Беккер улыбнулся и поднял коробку.

 Вирус? - холодно переспросил директор.  - Вы оба думаете, что в нашем компьютере вирус. Бринкерхофф растерянно заморгал. - Да, сэр, - сказала Мидж. - Потому что Стратмор обошел систему Сквозь строй? - Фонтейн опустил глаза на компьютерную распечатку.

Если он сумеет реализовать свой замысел, это стократно компенсирует провал Попрыгунчика. Фонтейн пришел к выводу, что Стратмор в полном порядке, что он трудится на сто десять процентов, все так же хитер, умен и в высшей степени лоялен, впрочем - как. Лучшее, что мог сделать директор, - не мешать ему работать и наблюдать за тем, как коммандер творит свое чудо. Стратмор разработал план… и план этот Фонтейн не имел ни малейшего намерения срывать. ГЛАВА 75 Пальцы Стратмора время от времени касались беретты, лежавшей у него на коленях.

 Вот.  - Она едва заметно подмигнула.  - В этом все и .

Хейл достаточно понимал язык программирования Лимбо, чтобы знать, что он очень похож на языки Си и Паскаль, которые были его стихией. Убедившись еще раз, что Сьюзан и Стратмор продолжают разговаривать, Хейл начал импровизировать. Введя несколько модифицированных команд на языке Паскаль, он нажал команду ВОЗВРАТ. Окно местоположения Следопыта откликнулось именно так, как он рассчитывал.

Через шестьдесят секунд у него над головой затрещал интерком. - Прошу начальника систем безопасности связаться с главным коммутатором, где его ждет важное сообщение. От изумления у Джаббы глаза вылезли на лоб. Похоже, она от меня не отвяжется. И он решил не реагировать на сообщение.

Шифры, которые невозможно взломать.

3 Response
  1. Istondever1989

    Flooding is experienced all over the globe and for a variety of reasons — but why exactly does flooding occur?

Leave a Reply