Virginia Erosion and Sediment Control
Inspector Exam
Erosion Impact Area - Correct Answers ✅area of land NOT
ASSOCIATED with a current land- disturbing activity but
contributing to sedimentation
How much more soil loss occurs from construction sites
versus natural soil erosion rates? Agricultural land? - Correct
Answers ✅1000 times more than the average natural soil
erosion rate.
20 times more than agricultural land.
What are 4 erosive forces? - Correct Answers ✅wind
water
ice
gravity
Name and define 5 stages of soil erosion. - Correct Answers
✅Raindrop- 90% of total soil erosion
Sheet- the soils ability to infiltrate water is exceeded and it
runs in sheet flow (about 100 ft before concentrating), how
sediment gets transported
Rill- when sheet flow begins to concentrate, velocity and
turbulence increase, but easily repaired
Gully-when rills converge, larger than rill and usually requires
heavy equipment to repair
, Virginia Erosion and Sediment Control
Inspector Exam
Channel- large volume of water increases the gully, vertical
sides are observed or for an existing streambed when
structural integrity is destroyed
What are the factors of rainfall impact? - Correct Answers
✅Kinetic energy is dependent on rainfall amount/intensity,
raindrop diameter, and raindrop velocity
What are two damaging effects of rainfall impact? - Correct
Answers ✅Causes soil compression which reduces
infiltration
Mainly occurs in May-Sept which is when disturbance is most
active
4 factors influencing erosion - Correct Answers ✅climate
groundcover (influenced by humans)
soil properties
topography (influenced by humans)
What percent reduction occurs from vegetative cover? -
Correct Answers ✅90-99%
What are soil properties? - Correct Answers ✅Structure
(particles adhere)
Texture (size)
Inspector Exam
Erosion Impact Area - Correct Answers ✅area of land NOT
ASSOCIATED with a current land- disturbing activity but
contributing to sedimentation
How much more soil loss occurs from construction sites
versus natural soil erosion rates? Agricultural land? - Correct
Answers ✅1000 times more than the average natural soil
erosion rate.
20 times more than agricultural land.
What are 4 erosive forces? - Correct Answers ✅wind
water
ice
gravity
Name and define 5 stages of soil erosion. - Correct Answers
✅Raindrop- 90% of total soil erosion
Sheet- the soils ability to infiltrate water is exceeded and it
runs in sheet flow (about 100 ft before concentrating), how
sediment gets transported
Rill- when sheet flow begins to concentrate, velocity and
turbulence increase, but easily repaired
Gully-when rills converge, larger than rill and usually requires
heavy equipment to repair
, Virginia Erosion and Sediment Control
Inspector Exam
Channel- large volume of water increases the gully, vertical
sides are observed or for an existing streambed when
structural integrity is destroyed
What are the factors of rainfall impact? - Correct Answers
✅Kinetic energy is dependent on rainfall amount/intensity,
raindrop diameter, and raindrop velocity
What are two damaging effects of rainfall impact? - Correct
Answers ✅Causes soil compression which reduces
infiltration
Mainly occurs in May-Sept which is when disturbance is most
active
4 factors influencing erosion - Correct Answers ✅climate
groundcover (influenced by humans)
soil properties
topography (influenced by humans)
What percent reduction occurs from vegetative cover? -
Correct Answers ✅90-99%
What are soil properties? - Correct Answers ✅Structure
(particles adhere)
Texture (size)
