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CISEC EXAM A
QUESTION: What is erosion? - ANSWER-The process by which soil particles get displaced by the
act of wind or water
QUESTION: What are three types of wind erosion? - ANSWER-Surface Creep, Saltation, and
Suspension
QUESTION: Rolling and sliding movement of particles across a surface.
5-25% total soil loss by wind - ANSWER-Surface creep
QUESTION: Hopping and bouncing movement of particles.
50-80% total soil loss by wind - ANSWER-Saltation
QUESTION: Small, lightweight particles carried great distances by wind. Less than 10% total soil
loss by wind is defined as? - ANSWER-Suspension
QUESTION: What are the types of water erosion? - ANSWER-Raindrop erosion,
Sheet erosion,
Rill and gully erosion,
Stream and channel erosion,
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Shoreline erosion,
Landslides
QUESTION: What is sheet erosion? - ANSWER-Stripping of soil that occurs due to sheet flows of
runoff
QUESTION: Rill and Gully Erosion
· If the runoff is allowed to concentrate and gain velocity or energy, it will cut rills and gullies as
it detaches more soil particles
· Rills: less than or equal to 3" deep
· Gullies: 3 or more rills converted to greater that 3" deep - ANSWER-· If the runoff is allowed to
concentrate and gain velocity or energy, it will cut rills and gullies as it detaches more soil
particles
· Rills: less than or equal to 3" deep
· Gullies: 3 or more rills converted to greater that 3" deep
QUESTION: Removal of soil and other embankment materials due to concentrated channel
flows - ANSWER-Streambank / Channel Erosion
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QUESTION: True or False: Rills are more than 75mm deep and are often the start of gullies -
ANSWER-False.
Gullies are more than 75mm deep, Rills are less than 3" deep
QUESTION: What factors impact rainfall erosion?
Climate events
Soil erodibility
Length of flow down a slope
Slope of land (critical)
Erosion control BMPs
Sediment control BMPs - ANSWER-Climate events
Soil erodibility
Length of flow down a slope
Slope of land (critical)
Erosion control BMPs
Sediment control BMPs
QUESTION: True or False: Clay is highly erodible. - ANSWER-False
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