EROSION

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EROSION
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GRAVITY
4 TYPES OF MASS MOVEMENT CAUSED BY GRAVITY
1. Landslide 2. Mudflow 3. Slump 4.
Creep
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LANDSLIDE
Most destructive . When rock and soil slide
quickly down a steep slope. Where road builders
have cut highways through hills or mountains.
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MUDFLOW
Rapid downhill movement of water, rock and soil
Can be 60 water. Usually after heavy rains.
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SLUMP
A mass of rock and soil suddenly slips down a
slope. Moves in one large mass. Often occurs
when water soaks the base of a mass of soil that
is rich in clay.
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CREEP
Very slow downhill movement of rock and soil.
Can occur on gentle slopes. Barely noticeable.
Tilts gravestones, fence posts, telephone poles.
Result from freezing and thawing of water in
cracked layers of rock beneath the soil.
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NUMBER ONE POLLUNTANT

• Sediment!

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Sediment FenceKeeps sediment on the construction
site, not in our streams.
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Sediment PondKeeps sediment from contained in
the pond. Lets it settle to the bottom before
allowing water to move off into our streams.
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Where do we get our drinking water?

• Our streams, of course!

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Where does your water go?
All run off, rain water, sediment, pollutants,
run directly into our streams. In is NOT legal
to dump ANYTHING into our streams and rivers!
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What happens when you flush?
We have pipes designated for sewage flow.
Sometimes these pipes are also used for rain
water. If there is a huge amount of rain, they
can overflow the system and raw sewage ends up in
our streams!
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Sewage Treatment Plant
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SO

• Keep the soil out of the streams!
• Dont ever dump anything into the
  streamsdirectly or indirectly!
• RememberYou drink that water!