flooding

Question 1

when will flooding occur

Answer 1

if increase in discharge, river will burst its banks leading to fluvial flooding

Question 2

areas at risk

Answer 2

-low lying parts of floodplains=groundwater flooding
-urbanised areas=impermeable surfaces=surface water flooding
-small basins=flash flooding as short lag time
-

Question 3

physical causes of flooding

Answer 3

• heavy, prolonged rainfall (brought by mid-latitude depressions)
• intese storms=flah flooding due to low pressure systems
• monsoonal rainfall (wind system blowing from sea to land effecting asia from may-sept)=large scale rainfall
• snowmelt=increased discharge
• arrival of ITCZ (low pressure system)

Question 4

human actions exacerbating flooding

Answer 4

• deforestion=increases magnitude as trees act as flood defence and water storage as involved in the hydrological cycle
• river mismanagement i.e. channelisation and straightening increasing risk downstream
• urbanisation