Transcript Drainage – Flood

DRAINAGE
What are drains?
A drain is the place where all our waste
water goes.
It also collects rain water.
2
How much water do we use?
150 litres a day!
Drainage
How you use water......
Drainage
4
What happens if drains are damaged or
full?
Photograph
Photograph
reproduced
courtesy
of
South
Wales
Publications
Ltd.
Photograph reproduced
reproduced courtesy
courtesy of
of South
South Wales
Wales Publications
Publications Ltd.
Ltd.
These are instances of flooding.
5
Drains need to be replaced, or made bigger.......
Creep
Growth
WHY?
Deterioration
Climate
Change
6
Climate Change......What is going to happen?
Winters are getting wetter.
Climate Change
7
Growth – More people building houses
8
More People
More Water Used
Growth
Sewers are fuller!
9
Creep – People paving over gardens
10
Paving
Drain
What is ‘Creep’?
11
How much water
does a tree use?
265 litres a day!
Most people just drink 2 litres a
day!
12
Can you drink as much water as a tree?
•An average tree takes up 264 litres a day
from the ground though it’s roots.
•That’s 180ml a minute!
•Trees roots are usually as long as the
tree is tall, so a tree 5 meters tall collects
water 5 meters away from the trunk.
•This is the same as a person drinking
750ml of water through a straw in 10
seconds.
•How much water can you drink though a
straw in 10 seconds?
Challenge 1
13
Transpiration
The water that
trees breath out.
8 trees = 2120litres
Drain
Creep
14
How else do trees help drainage?
•The roots from trees make the soil
more porous. This means it can soak
more water.
•Which is more porous, a sponge or a
stone?
•Tip 500ml of water over both items,
and measure how much water you
collect underneath.
•The more porous the material, the
less water you should collect.
Challenge 2
15
How else do trees help drainage?
•Can you make a material more
porous?
•Take a piece of clay and pour water
over it. Collect and measure the
water.
•Experiment with ways of making the
clay more porous and repeat the test.
Challenge 3
16
How much creep is happening?
•Since 1945,
an area of
around 139
square
Kilometres
has been
paved over
in cities such
as Cardiff.
•That’s the
same as 310
times the
size of the
the
Millennium
Stadium!
Millennium Stadium
17
Waste from people can affect the sewers.
Clean Sewer.
Sewer filled with fat, oil and
grease.
Deterioration
18
This is a sewer tunnelling
machine.
How easy is it to put them in?
2005
1895
Deterioration
19
What can we do?
Collect ‘Grey Water’
Drainage
20
What can we do?
Plant some plants
Before
After –
The plants here are highly
water absorbent.
Drainage
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What can we do?
Plant some plants
After –
Also help calm traffic, as
well as absorbing water.
Before
Drainage
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What can we do?
Glencoe Elementary School
Raingarden
Make
a rain
Drawn by: Kevin Perry
water garden
April 27, 2005
Again, highly absorbent plants to
take up as much water as
possible, and reduce the amount
entering drains.
Drainage
23
AND FINALLY,
Be more water efficient!
Reduce how much water you put down the drain! 24