Stormwater Construction Inspector
Exam Questions and Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary purpose of construction-site stormwater controls?
A. Increase construction productivity
B. Reduce stormwater pollution and protect receiving waters
C. Eliminate all runoff from the site
D. Increase soil disturbance
Correct Answer: B. Reduce stormwater pollution and protect receiving waters
Rationale: Construction activities can expose soil and introduce pollutants into
stormwater runoff. Stormwater controls are implemented to reduce pollutant
transport and protect downstream water quality.
2. What is stormwater runoff?
A. Water stored permanently beneath the ground
B. Water used only for construction equipment
C. Precipitation that flows over or across land surfaces
D. Water contained exclusively within wetlands
Correct Answer: C. Precipitation that flows over or across land surfaces
Rationale: Stormwater runoff occurs when precipitation moves across the land
surface rather than infiltrating into the soil or being otherwise retained.
Construction sites can generate increased runoff because of grading and
impervious surfaces.
3. Which surface generally produces greater runoff because it limits infiltration?
,A. Concrete pavement
B. Dense forest soil
C. Mulched soil
D. Vegetated grass
Correct Answer: A. Concrete pavement
Rationale: Concrete is highly impervious, so rainfall cannot readily infiltrate
through it. This increases the amount and often the velocity of surface runoff
compared with vegetated or pervious surfaces.
4. What is erosion?
A. The settling of suspended particles
B. The detachment and transport of soil particles
C. The infiltration of water into soil
D. The treatment of contaminated water
Correct Answer: B. The detachment and transport of soil particles
Rationale: Erosion involves soil particles being detached and moved by forces such
as rainfall, runoff, wind, ice, or gravity. Sediment controls address the movement
of already-eroded material.
5. What is sedimentation?
A. Detachment of soil by raindrop impact
B. Infiltration of runoff into soil
C. Settling or deposition of transported sediment
D. Vegetation growth on exposed soil
Correct Answer: C. Settling or deposition of transported sediment
Rationale: Sedimentation occurs when transported particles settle out of water or
are deposited elsewhere. Sediment basins and traps use this principle to remove
suspended sediment from runoff.
,6. Which condition generally increases the potential for soil erosion?
A. Dense vegetation
B. Stable mulch cover
C. Exposed bare soil
D. Permanent pavement
Correct Answer: C. Exposed bare soil
Rationale: Bare soil lacks the protection provided by vegetation or other cover.
Raindrop impact and surface runoff can therefore detach and transport soil more
easily.
7. What is sheet erosion?
A. Removal of soil in a relatively thin layer by shallow overland flow
B. Formation of a large incised channel
C. Deposition of sediment inside a basin
D. Movement of soil exclusively by wind
Correct Answer: A. Removal of soil in a relatively thin layer by shallow overland
flow
Rationale: Sheet erosion occurs when runoff removes soil relatively uniformly
across an area. It can be an early stage of erosion before concentrated flow
creates rills or gullies.
8. What characterizes rill erosion?
A. Formation of small channels from concentrated runoff
B. Deposition of sediment in a pond
C. Complete stabilization of a slope
D. Infiltration through undisturbed soil
Correct Answer: A. Formation of small channels from concentrated runoff
, Rationale: Rills are small channels formed when runoff becomes concentrated and
begins cutting into exposed soil. If left unchecked, rills can develop into larger
gullies.
9. What is one primary function of vegetation on disturbed soil?
A. Increase runoff velocity
B. Protect and stabilize the soil surface
C. Increase sediment transport
D. Eliminate the need for drainage controls
Correct Answer: B. Protect and stabilize the soil surface
Rationale: Vegetation reduces raindrop impact, increases surface roughness,
promotes infiltration, and helps hold soil in place through root systems.
10. What is temporary stabilization intended to accomplish?
A. Maintain exposed soil indefinitely
B. Protect disturbed soil until permanent stabilization can occur
C. Increase sediment movement
D. Replace all stormwater conveyance systems
Correct Answer: B. Protect disturbed soil until permanent stabilization can occur
Rationale: Temporary stabilization measures such as mulch, temporary seeding, or
erosion-control blankets protect exposed areas during periods before final
stabilization is established.
11. What is the primary purpose of a Stormwater Pollution Prevention Plan
(SWPPP)?
A. Establish construction payroll procedures
B. Identify potential stormwater pollution sources and describe control measures
C. Replace construction drawings
D. Determine equipment maintenance schedules only
Exam Questions and Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary purpose of construction-site stormwater controls?
A. Increase construction productivity
B. Reduce stormwater pollution and protect receiving waters
C. Eliminate all runoff from the site
D. Increase soil disturbance
Correct Answer: B. Reduce stormwater pollution and protect receiving waters
Rationale: Construction activities can expose soil and introduce pollutants into
stormwater runoff. Stormwater controls are implemented to reduce pollutant
transport and protect downstream water quality.
2. What is stormwater runoff?
A. Water stored permanently beneath the ground
B. Water used only for construction equipment
C. Precipitation that flows over or across land surfaces
D. Water contained exclusively within wetlands
Correct Answer: C. Precipitation that flows over or across land surfaces
Rationale: Stormwater runoff occurs when precipitation moves across the land
surface rather than infiltrating into the soil or being otherwise retained.
Construction sites can generate increased runoff because of grading and
impervious surfaces.
3. Which surface generally produces greater runoff because it limits infiltration?
,A. Concrete pavement
B. Dense forest soil
C. Mulched soil
D. Vegetated grass
Correct Answer: A. Concrete pavement
Rationale: Concrete is highly impervious, so rainfall cannot readily infiltrate
through it. This increases the amount and often the velocity of surface runoff
compared with vegetated or pervious surfaces.
4. What is erosion?
A. The settling of suspended particles
B. The detachment and transport of soil particles
C. The infiltration of water into soil
D. The treatment of contaminated water
Correct Answer: B. The detachment and transport of soil particles
Rationale: Erosion involves soil particles being detached and moved by forces such
as rainfall, runoff, wind, ice, or gravity. Sediment controls address the movement
of already-eroded material.
5. What is sedimentation?
A. Detachment of soil by raindrop impact
B. Infiltration of runoff into soil
C. Settling or deposition of transported sediment
D. Vegetation growth on exposed soil
Correct Answer: C. Settling or deposition of transported sediment
Rationale: Sedimentation occurs when transported particles settle out of water or
are deposited elsewhere. Sediment basins and traps use this principle to remove
suspended sediment from runoff.
,6. Which condition generally increases the potential for soil erosion?
A. Dense vegetation
B. Stable mulch cover
C. Exposed bare soil
D. Permanent pavement
Correct Answer: C. Exposed bare soil
Rationale: Bare soil lacks the protection provided by vegetation or other cover.
Raindrop impact and surface runoff can therefore detach and transport soil more
easily.
7. What is sheet erosion?
A. Removal of soil in a relatively thin layer by shallow overland flow
B. Formation of a large incised channel
C. Deposition of sediment inside a basin
D. Movement of soil exclusively by wind
Correct Answer: A. Removal of soil in a relatively thin layer by shallow overland
flow
Rationale: Sheet erosion occurs when runoff removes soil relatively uniformly
across an area. It can be an early stage of erosion before concentrated flow
creates rills or gullies.
8. What characterizes rill erosion?
A. Formation of small channels from concentrated runoff
B. Deposition of sediment in a pond
C. Complete stabilization of a slope
D. Infiltration through undisturbed soil
Correct Answer: A. Formation of small channels from concentrated runoff
, Rationale: Rills are small channels formed when runoff becomes concentrated and
begins cutting into exposed soil. If left unchecked, rills can develop into larger
gullies.
9. What is one primary function of vegetation on disturbed soil?
A. Increase runoff velocity
B. Protect and stabilize the soil surface
C. Increase sediment transport
D. Eliminate the need for drainage controls
Correct Answer: B. Protect and stabilize the soil surface
Rationale: Vegetation reduces raindrop impact, increases surface roughness,
promotes infiltration, and helps hold soil in place through root systems.
10. What is temporary stabilization intended to accomplish?
A. Maintain exposed soil indefinitely
B. Protect disturbed soil until permanent stabilization can occur
C. Increase sediment movement
D. Replace all stormwater conveyance systems
Correct Answer: B. Protect disturbed soil until permanent stabilization can occur
Rationale: Temporary stabilization measures such as mulch, temporary seeding, or
erosion-control blankets protect exposed areas during periods before final
stabilization is established.
11. What is the primary purpose of a Stormwater Pollution Prevention Plan
(SWPPP)?
A. Establish construction payroll procedures
B. Identify potential stormwater pollution sources and describe control measures
C. Replace construction drawings
D. Determine equipment maintenance schedules only
