Erosion and Sediment Control Inspector
Exam Questions and Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
Question 1
What is the primary purpose of erosion and sediment control on a construction
site?
A. To increase the rate of soil disturbance
B. To eliminate all stormwater runoff
C. To prevent soil loss and minimize sediment movement from disturbed areas
D. To eliminate the need for site inspections
Correct Answer: C
Rationale: Erosion and sediment controls are intended to reduce detachment,
transport, and deposition of soil caused by construction activities and runoff. They
do not eliminate all runoff or replace proper inspection and site management.
Question 2
Which process occurs when raindrops strike exposed soil and dislodge individual
soil particles?
A. Splash erosion
B. Gully erosion
C. Channel erosion
D. Deposition
Correct Answer: A
,Rationale: Splash erosion begins when the impact energy of falling raindrops
detaches soil particles. These particles may subsequently be transported by
flowing water.
Question 3
Which type of erosion is characterized by the removal of a relatively uniform thin
layer of soil by shallow surface runoff?
A. Gully erosion
B. Sheet erosion
C. Streambank erosion
D. Wind-blown saltation
Correct Answer: B
Rationale: Sheet erosion involves relatively uniform removal of soil from the
surface by shallow overland flow. If concentrated flow develops, rills and
eventually gullies may form.
Question 4
What distinguishes rill erosion from sheet erosion?
A. Rill erosion occurs only from wind
B. Rill erosion involves small concentrated flow channels
C. Rill erosion occurs only in permanent streams
D. Rill erosion cannot occur on construction sites
Correct Answer: B
Rationale: Rill erosion develops when surface runoff becomes concentrated into
small channels. These channels are larger and more defined than the relatively
uniform flow associated with sheet erosion.
Question 5
,Which factor generally increases the erosive potential of surface runoff?
A. Increased vegetative cover
B. Reduced slope length
C. Increased flow velocity
D. Increased soil infiltration
Correct Answer: C
Rationale: Higher flow velocity increases the energy available to detach and
transport soil particles. Erosion potential is therefore strongly influenced by runoff
velocity and concentration.
Question 6
What is the primary function of vegetation in erosion control?
A. To increase exposed soil
B. To stabilize soil and reduce the energy of rainfall and runoff
C. To prevent all infiltration
D. To increase sediment transport
Correct Answer: B
Rationale: Vegetation protects the soil surface from raindrop impact, increases
surface roughness, promotes infiltration, and helps hold soil with roots. These
effects reduce erosion.
Question 7
Which site condition generally produces more runoff?
A. Dense established vegetation
B. Undisturbed forest litter
C. Highly impervious or compacted surfaces
D. Deep uncompacted topsoil
Correct Answer: C
, Rationale: Impervious and heavily compacted surfaces generally reduce
infiltration and increase the proportion of precipitation that becomes surface
runoff.
Question 8
What does the term run-on describe at a construction site?
A. Water entering the site from an external area
B. Water infiltrating into soil
C. Water stored in a sediment basin
D. Water evaporating from the site
Correct Answer: A
Rationale: Run-on is stormwater originating outside a disturbed area or project
boundary that flows onto the site. Proper diversion or conveyance can prevent
unnecessary contact with disturbed soil.
Question 9
Which practice is most directly intended to keep clean water from contacting a
disturbed construction area?
A. Sediment basin
B. Diversion or perimeter conveyance
C. Construction entrance
D. Inlet filter
Correct Answer: B
Rationale: Diversions and similar runoff-management practices can intercept and
redirect clean runoff around disturbed areas, reducing the amount of water that
can cause erosion.
Question 10
Exam Questions and Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
Question 1
What is the primary purpose of erosion and sediment control on a construction
site?
A. To increase the rate of soil disturbance
B. To eliminate all stormwater runoff
C. To prevent soil loss and minimize sediment movement from disturbed areas
D. To eliminate the need for site inspections
Correct Answer: C
Rationale: Erosion and sediment controls are intended to reduce detachment,
transport, and deposition of soil caused by construction activities and runoff. They
do not eliminate all runoff or replace proper inspection and site management.
Question 2
Which process occurs when raindrops strike exposed soil and dislodge individual
soil particles?
A. Splash erosion
B. Gully erosion
C. Channel erosion
D. Deposition
Correct Answer: A
,Rationale: Splash erosion begins when the impact energy of falling raindrops
detaches soil particles. These particles may subsequently be transported by
flowing water.
Question 3
Which type of erosion is characterized by the removal of a relatively uniform thin
layer of soil by shallow surface runoff?
A. Gully erosion
B. Sheet erosion
C. Streambank erosion
D. Wind-blown saltation
Correct Answer: B
Rationale: Sheet erosion involves relatively uniform removal of soil from the
surface by shallow overland flow. If concentrated flow develops, rills and
eventually gullies may form.
Question 4
What distinguishes rill erosion from sheet erosion?
A. Rill erosion occurs only from wind
B. Rill erosion involves small concentrated flow channels
C. Rill erosion occurs only in permanent streams
D. Rill erosion cannot occur on construction sites
Correct Answer: B
Rationale: Rill erosion develops when surface runoff becomes concentrated into
small channels. These channels are larger and more defined than the relatively
uniform flow associated with sheet erosion.
Question 5
,Which factor generally increases the erosive potential of surface runoff?
A. Increased vegetative cover
B. Reduced slope length
C. Increased flow velocity
D. Increased soil infiltration
Correct Answer: C
Rationale: Higher flow velocity increases the energy available to detach and
transport soil particles. Erosion potential is therefore strongly influenced by runoff
velocity and concentration.
Question 6
What is the primary function of vegetation in erosion control?
A. To increase exposed soil
B. To stabilize soil and reduce the energy of rainfall and runoff
C. To prevent all infiltration
D. To increase sediment transport
Correct Answer: B
Rationale: Vegetation protects the soil surface from raindrop impact, increases
surface roughness, promotes infiltration, and helps hold soil with roots. These
effects reduce erosion.
Question 7
Which site condition generally produces more runoff?
A. Dense established vegetation
B. Undisturbed forest litter
C. Highly impervious or compacted surfaces
D. Deep uncompacted topsoil
Correct Answer: C
, Rationale: Impervious and heavily compacted surfaces generally reduce
infiltration and increase the proportion of precipitation that becomes surface
runoff.
Question 8
What does the term run-on describe at a construction site?
A. Water entering the site from an external area
B. Water infiltrating into soil
C. Water stored in a sediment basin
D. Water evaporating from the site
Correct Answer: A
Rationale: Run-on is stormwater originating outside a disturbed area or project
boundary that flows onto the site. Proper diversion or conveyance can prevent
unnecessary contact with disturbed soil.
Question 9
Which practice is most directly intended to keep clean water from contacting a
disturbed construction area?
A. Sediment basin
B. Diversion or perimeter conveyance
C. Construction entrance
D. Inlet filter
Correct Answer: B
Rationale: Diversions and similar runoff-management practices can intercept and
redirect clean runoff around disturbed areas, reducing the amount of water that
can cause erosion.
Question 10
