Human actions increasing flood risk

Question 1

Urbanisation

Increase flooding

Answer 1

Floodplains built upon by impermeable surfaces e.g. tarmac

Question 2

River mismanagement (Hard engineering - artificial structures)
Increase flooding

Answer 2

Channelisation: (Makes river deeper so it can hold more water)
Displaces the river downstream. Some other location may well be overwhelmed by the increased discharge.

Dams: block the flow of sediment down a river, so the reservoir gradually fills up with silt.

River embankments: (Raising the banks of a river means that it can hold more water)
They can fail when a flood exceeds their capacity.