Virginia Erosion and Sediment Control
Inspector Exam with correct answers
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
|| || ||
, 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) ||
Bulk density (how tightly packed)
|| || || ||
% organic matter
|| ||
infiltration (into soil) || ||
Inspector Exam with correct answers
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
|| || ||
, 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) ||
Bulk density (how tightly packed)
|| || || ||
% organic matter
|| ||
infiltration (into soil) || ||
