DR . KHAIRUL BASHAR
COURSE SIMPLY NO: GS 410
4th season (Hons)
SECTION OF GEOLOGICAL SCIENCES
1 . What is flood?
installment payments on your What are the causes of floods?
3. What are several types of flood?
four. What are the consequences of flood?
five. Discuss the several methods of control and avoidance of avalanche. 6. Just how flood could be predicted? Go over prediction of flood
consistency, prediction of flow period, flood course-plotting and
catchments basin building.
7. Go over the вЂ“
i. Prolong of surging
ii. Steps taken to control flooding
iii. Advantages of measures taken
4. Disadvantages of the measures used for stick to two estuaries and rivers a. Mississippi river
n. Kissimmee lake
8. Exactly what the causes of surging in Bangladesh?
9. How the floods of Bangladesh can be controlled?
A flood is comparatively high flow of stream or tidal drinking water that overtops the natural or artificial banks in any of the extends to of a stream plain or perhaps coastal basic. A ton is an overflow associated with an expanse of water that submerges land, a deluge. In the sense of " flowing water", the term may also be used on the inflow of the tide. Flooding can result from the amount of water in a body of water, like a river or lake, which will overflows, with the result that some of the water escapes it is normal limitations.
Flooding occurs a lake has too much water in the channel. The breaks through the river banking institutions and distributes over the surrounding land. (Flood Wikipedia, the free encyclopedia) Causes of floods
Causes or origin of flooding may divide by simply two ways:
a. Geological causes
b. Liveliness causes
пѓј Excessive anticipation
пѓј Snow melt
пѓј Ice dams melts
пѓј Glaciers dissolve
пѓј Global-warming sea-level rise
пѓј Organic disequilibrium in the rate of sediment supply causes the shifting in the river study course and fast riverbed aggradations.
Human activity triggers
пѓј Deforestation & poor-cropping practice.
пѓј Dam failing
a) Geologic causes: Among the geologic causes which are predominant, are described below,
пѓј Excess precipitation: It is the primary cause for most floods. Capacity to carry water by a stream is surpass due to extreme rainfall. 3|Page
пѓј Snow melt: Following heavy rain fall, rapid change in weather coupled with already condensed ground may cause flood.
пѓј Ice dam melts: In cold polar river ice cubes dam is done in certain portion of the river which will at a threshold stops working to form ice barrier. пѓј Landslides: Landslides blocking stream courses causing the backwater overflowing water banks. Hence when landslide occur, the impound normal water may rush the obstacle and trigger downstream water damage.
пѓј Glaciers melts: Occasionally in Froid Lake ice barrier malfunction by within weather conditions to result in flood.
пѓј River bed aggradation: It reduces water carrying capability and increases riverbed amounts and improved flooding propensity. пѓј Level of residue supply: Organic disequilibrium inside the rate of sediment source causes the shifting from the river study course and speedy riverbed aggradations.
пѓј Typhoons, cyclones and sometimes volcanism triggers melt of Iceland, leads to flooding.
b) Human activity triggers: Human are very much accountable for flooding. The key causes are,
пѓј Urbanization: It makes the ground impervious to percolation and therefore have caused more and large avalanche.
пѓј Deforestation: Deforestation of steep mountains is believed to lead accelerated soil erosion and landslides, which in turn is definitely believed to lead to devastating floods in the downstream regions.
пѓј Channelization: Confinement of waterways by anatomist work might produce bigger flood top in downstream reaches.
пѓј Dam failing: When stream carrying flows in excess of the transporting potential then as a result of heavy pressure of normal water, the...
Sources: п‚· Islam, N. (1998) Alternative to avalanche control: The truth of Bangladesh.
п‚· Khalequzzaman, M. Overflow control in Bangladesh trough best
п‚· Watson, My spouse and i. & Burnett, A. G. Hydrology
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