A flood is an overflow of water that submerges
land which is usually dry. The EU Floods Directive defines a flood as a covering by water of land not normally covered by
water. In the sense of
"flowing water", the word may also be applied to the inflow of the tide.
Flooding may occur as an overflow of
water from water bodies, such as a river, lake, or ocean, in which the water
overtops or break-sleeves, resulting in some of that water escaping its usual
boundaries, or it may occur due to an accumulation of rainwater on saturated
ground in an areal flood. While the size of a lake or other body of water will
vary with seasonal changes in precipitation
and snow melt, these changes in size are unlikely to be considered significant
unless they flood property or
drown domestic animals.
Floods can also occur in rivers when
the flow rate exceeds the capacity of the river
channel, particularly at bends or meanders in
the waterway. Floods often cause damage to homes and businesses if they are in
the natural flood plains of rivers. While riverine flood damage can be
eliminated by moving away from rivers and other bodies of water, people have
traditionally lived and worked by rivers because the land is usually flat and fertile and because rivers provide easy travel
and access to commerce and industry.
Some floods develop slowly, while
others such as flash floods, can
develop in just a few minutes and without visible signs of rain. Additionally,
floods can be local, impacting a neighborhood or community, or very large,
affecting entire river basins.
Several days of heavy
rain and flooding in southern and eastern China , has left at least 128 people
dead and over 40 missing, according to Chinese authorities. Some areas have recorded
over 200 mm of rain in 24 hours.
Over the next few
days, the rain band currently affecting the middle and lower reaches of Yangtze
River is expected to move north, gradually reaching the Huaihe
River , central and southern Huang-Huai River , Sichuan
Basin, and Northwest China . CMA also say that
Nepartak, this year’s first typhoon, transformed from a severe tropical storm
to a typhoon level earlier today, 05 July 2016, where it was located about
2,000 km away from southeastern Taipei, Taiwan province
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