Causes And Effects Of Floods And Droughts Pdf

causes and effects of floods and droughts pdf

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Other methods include levees, dikes, dams, retention or detention basins. Communities preferred improvement of drainage structures with detention basins near the sites.

Availability of freshwater globally however, is limited. Out of the 2. The distribution of the water thus available is not uniform and is highly uneven in both space and time. Due to hydrological, topographical and geological limitations, however, only km3 of surface water can be utilized by conventional storage and diversion structures.

Drought and Your Health

Flooding is experienced all over the globe and for a variety of reasons — but why exactly does flooding occur? There are several human causes of flooding, including poorly designed infrastructure. There are also natural reasons flooding happens. Here are eight of the most common causes of flooding, both natural and human-induced. And the consequences of flooding can be savage. The simplest explanation for flooding is heavy rains.

This creates a water shortage that damages crops, livestock, and the environment. Since droughts adversely impact the agricultural industry, those that depend on the commodities from the industry suffer as well. Food becomes more scarce and demand exceeds supply. Prices go up, and the commodities markets waiver. If the economy is already in a state of depression or recession, a drought can increase that state.

Drought is a natural phenomenon in which rainfall is lower than average for an extended period of time. Periods of drought can result in inadequate water supply and can lead to public health problems. Take action and learn how drought can impact your health and the health of your family. Cycles of drought have affected North America for the last 10, years. Droughts can last from a single season to many decades and can affect from a few hundred to millions of square miles.

What Causes Floods? Top 8 Common Causes of Flooding

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. Floods impact both individuals and communities, and have social, economic, and environmental consequences Table 1. As most people are well aware, the immediate impacts of flooding include loss of human life, damage to property, destruction of crops, loss of livestock, and deterioration of health conditions owing to waterborne diseases. As communication links and infrastructure such as power plants, roads and bridges are damaged and disrupted, some economic activities may come to a standstill, people are forced to leave their homes and normal life is disrupted.

The lack of precipitation as well as heavy downpours are.

Flood control

Natural and Man-Made Hazards pp Cite as. India is a land of monsoons of which the South-West Monsoon is a wet monsoon while the North-East Monsoon is a dry one. Yet the rainfall produced by them is not uniformly distributed either in space or in time which therefore leads to the occurrence of floods and droughts in different parts of the country from time to time. While floods are confined to restricted areas based on the distribution of the major river systems, droughts are only on account of rainfall failures following late onset or early withdrawal or both of the monsoons. The paper describes the main features of the annual and seasonal rainfall distribution over India and discusses their implications in the occurrence of floods and droughts.

Flood control methods are used to reduce or prevent the detrimental effects of flood waters. Floods are caused by many factors or a combination of any of these generally prolonged heavy rainfall locally concentrated or throughout a catchment area , highly accelerated snowmelt , severe winds over water, unusual high tides, tsunamis , or failure of dams, levees , retention ponds , or other structures that retained the water. Flooding can be exacerbated by increased amounts of impervious surface or by other natural hazards such as wildfires, which reduce the supply of vegetation that can absorb rainfall.

Floods are the most common natural disaster in the United States. According to the National Weather Service, floods kill 95 people a year on average. Global warming is causing more floods. As temperatures rise, the air holds more moisture.

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Hazards of Floods and Droughts in India

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