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 F a c t o r s  t h

 a t 

 i n c r e a s e  F l o o d

 i n g 

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Flooding

Flooding occurs when the discharge of thehigh and it oods the banks. The mainreasons why ooding occurs will be shownin the next few slides. The discharge of a

river is how much volume of water goespast a given point.

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Precipitation

Precipitation is a factor of ooding becausethe rate that that the soil will becomewaterlogged would happen quickertherefore surface run o will increase. This

would mean that the water is runningstraight through to the river. eaning theriver level would rise.

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Physical features

 The si!e and shape of a river"s drainagebasin dictates how much precipitation theriver can receive and the lag time which ishow quickly it can arrive. # large drainage

basin means that the river"s catchment areais large so it will collect a lot of water$increasing discharge.

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Physical features The number of tributaries owing into ariver aects the likelihood of oods. %f ariver has a lot of tributaries$ the river"sdischarge will be much higher because lotsof water will be entering it from its

tributaries. #fter heavy precipitation$ thedischarge will rise even more and oods arelikely$ especially at conuences as this iswhere discharge is highest.

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&uman Factors

&uman Factors include urbani!ation mainly.'uilding on land would mean lessforestation and building means concreteand that is impermeable therefore that

would increase surface runo and alsohuman usage like sewage systems all eectthe discharge