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Did you know?
Why should we study flooding?
* of 27 © Boardworks Ltd 2005…read more

Slide 3

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Did you know?
· What is a river flood?
Learning objectives
· Why do rivers flood?
· What caused the Boscastle flood?
· What were the effects of the Boscastle flood?
· How can the flood risk be managed?
* of 27 © Boardworks Ltd 2005…read more

Slide 4

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What is a flood?
A flood occurs whenever a
river overflows its banks
(exceeds its `bankfull
discharge').
However, a flood becomes
a problem when the water
rises to a level where it
threatens property and/or
life.
* of 27 © Boardworks Ltd 2005…read more

Slide 5

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Did you know?
· What is a river flood?
Learning objectives
· Why do rivers flood?
· What caused the Boscastle flood?
· What were the effects of the Boscastle flood?
· How can the flood risk be managed?
* of 27 © Boardworks Ltd 2005…read more

Slide 6

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Why do rivers flood?
Rivers usually flood due to a range of physical factors.
These physical factors can be divided into climatic factors
and drainage basin characteristics. Human intervention
can also make flooding worse.
A major flood devastated the
village of Lynmouth in Devon
in August 1952. 229mm of
rain fell in 24 hours. The
impact of this was increased
because narrow bridges
across the River Lyn acted as
dams and stopped the water
flowing away quickly.
* of 27 © Boardworks Ltd 2005…read more

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