1.1 Definition and cause flooding
or flood threat is the danger of flooding. Or hazardous conditions caused by water flow ER
overflowed the banks of rivers or water flooded the area, which usually is not submersible. Or caused by the accumulation of water on the area, which could exonerate the vent is covered with water. In general, the flooding is caused by the floods. Which can be divided into two major characteristic feature is
one) flooding / overflow their banks. A flood conditions occurred because the drainage system is inefficient. Usually occurs in the lowlands and river communities in major cities. A gradual manner Which was caused by heavy rains in that area for several consecutive days. Or conditions caused by water overflowing its banks. Most flooding occurs downstream and are spread over a wide area because they can not drain in time. The damage caused to crops and property is most common. For other damages There is not much that can be moved in a safe
2) flooding. A sudden flood occurred in the area. Due to heavy rains in the area, which is extremely steep. And has the ability to store water resistant or less as the upstream area, which has a slope of more space. Forests were destroyed to make space for retention or water resistance is reduced. Area roads and airports, etc., or due to other causes, such as a dam or reservoir collapse. Flash floods often occur after heavy rainfall of up to 6 hours and usually occurs in lowland areas in the valley. This may be no rain in the area before, but there is very heavy rain upstream that away. Due to severe flooding and moving very fast and the opportunity to prevent the escape was less. The damage from flooding is a whole lot of lives and property.
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