Transcript 1 It’s geography!

The causes of flooding
Aim: To know about some of the causes of flooding.
Starter activity: There will be 5 questions. You have
30 seconds to answer each one.
What’s going on
here?
How do you think
people feel about it?
What kinds of
problems do you think
it’s causing?
Do you think it’s
anyone’s fault?
What do you think will
happen to all the
water?
And when?
The water cycle
1 minute – partner work
What are floods?
Floods occur when a river gets more water
than its channel can hold. So water flows
over the banks and onto the flood plain.
Floods are usually caused by heavy rain –
but sometimes by ice or snow melting.
A burst of heavy rain can cause a sudden
flash flood. People get no warning so they
may get trapped and drown.
Today we are
going to
experiment to see
how humans can
effect their
environment and
the risk of flooding
in their area.
Factors that increase the risk of flooding
Example
Description
Example
Impermeable
rock
Cutting
trees down
Steep slopes
Very wet
soil
Hard dry soil
Building in a
drainage
basin
Description
Main activity
In your group test:
Experiment with what
happens to the water in
your experiment.
Write down your findings.
When the whistle blows
move to the next
experiment.
Plenary
Annotate (label with
information) your copy of
the diagram to show the
factors that increase the
risk of flooding.
HINT: Adding detail
(reasons why) will
improve this piece of
work.
Use the headings to help you add detail to the correct place
Heavy rain
Impermeable
rock
Soggy soil
Steep
slopes
Loss of
trees
Built up
areas
Flat flood plain
The flood plain is flat land around the
river that the river floods naturally when
it gets too full. If you live on a river’s
flood plain you are at risk of flooding.
Remember…
• …tick of the skills that you have used or
learnt this lesson.