Virginia Erosion and Sediment Control
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Terms in this set (35)
Erosion Impact Area area of land NOT ASSOCIATED with a current
land- disturbing activity but contributing to
sedimentation
How much more soil loss occurs 1000 times more than the average natural soil
from construction sites versus erosion rate.
natural soil erosion rates? 20 times more than agricultural land.
Agricultural land?
What are 4 erosive forces? wind
water
ice
gravity
, Name and define 5 stages of soil Raindrop- 90% of total soil erosion
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 Kinetic energy is dependent on rainfall
impact? amount/intensity, raindrop diameter, and raindrop
velocity
What are two damaging effects of Causes soil compression which reduces
rainfall impact? infiltration
Mainly occurs in May-Sept which is when
disturbance is most active
4 factors influencing erosion climate
groundcover (influenced by humans)
soil properties
topography (influenced by humans)
What percent reduction occurs 90-99%
from vegetative cover?
Inspector Exam fully solved & updated (latest
version verified for accuracy)
Save
Terms in this set (35)
Erosion Impact Area area of land NOT ASSOCIATED with a current
land- disturbing activity but contributing to
sedimentation
How much more soil loss occurs 1000 times more than the average natural soil
from construction sites versus erosion rate.
natural soil erosion rates? 20 times more than agricultural land.
Agricultural land?
What are 4 erosive forces? wind
water
ice
gravity
, Name and define 5 stages of soil Raindrop- 90% of total soil erosion
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 Kinetic energy is dependent on rainfall
impact? amount/intensity, raindrop diameter, and raindrop
velocity
What are two damaging effects of Causes soil compression which reduces
rainfall impact? infiltration
Mainly occurs in May-Sept which is when
disturbance is most active
4 factors influencing erosion climate
groundcover (influenced by humans)
soil properties
topography (influenced by humans)
What percent reduction occurs 90-99%
from vegetative cover?
