Stormwater Management Inspector
Exam Questions and Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary purpose of stormwater management?
A. Increase the rate of surface runoff
B. Eliminate all stormwater from developed sites
C. Protect water quality and manage the quantity and effects of stormwater
runoff
D. Replace sanitary sewer systems
Answer: C. Protect water quality and manage the quantity and effects of
stormwater runoff
Rationale: Stormwater management addresses both water-quality and water-
quantity impacts associated with land development. Effective management
reduces pollutant transport and helps control increased runoff volume, velocity,
and peak flows.
2. What does impervious cover generally do to stormwater runoff?
A. It generally increases runoff volume and reduces infiltration.
B. It eliminates peak discharge.
C. It increases soil infiltration.
D. It prevents runoff from reaching receiving waters.
Answer: A. It generally increases runoff volume and reduces infiltration.
Rationale: Impervious surfaces such as roofs, parking lots, and pavement prevent
rainfall from infiltrating into the soil. More rainfall therefore becomes surface
runoff, often increasing runoff volume and peak discharge.
,3. Which document identifies the stormwater controls and pollution-prevention
practices to be implemented for a construction project?
A. Property deed
B. Building elevation plan
C. Stormwater Pollution Prevention Plan (SWPPP)
D. Construction payroll
Answer: C. Stormwater Pollution Prevention Plan (SWPPP)
Rationale: A SWPPP identifies potential sources of stormwater pollution and the
practices used to minimize pollutant discharge. For regulated construction
activities, it incorporates or references applicable erosion, sediment, stormwater,
and pollution-prevention requirements.
4. What is the primary distinction between an ESC plan and a post-construction
SWM plan?
A. ESC plans apply only to buildings.
B. SWM plans apply only to temporary sediment fences.
C. ESC plans address only water quality after construction.
D. ESC plans primarily address erosion and sediment during land disturbance,
while SWM planning addresses post-construction stormwater management.
Answer: D. ESC plans primarily address erosion and sediment during land
disturbance, while SWM planning addresses post-construction stormwater
management.
Rationale: Erosion and sediment controls protect disturbed soil and receiving
waters during construction. Stormwater management measures are designed to
address the longer-term water-quality and water-quantity effects of development.
5. What does BMP stand for in stormwater management?
A. Basin Management Procedure
B. Best Management Practice
,C. Building Maintenance Permit
D. Basic Monitoring Plan
Answer: B. Best Management Practice
Rationale: BMP means Best Management Practice. The term is broadly used for
structural and nonstructural practices designed to prevent, reduce, or manage
stormwater impacts.
6. Which stormwater characteristic is most directly affected when natural
vegetation is replaced by extensive pavement?
A. Soil color
B. Groundwater chemistry only
C. Runoff generation
D. Air temperature
Answer: C. Runoff generation
Rationale: Vegetated soils generally allow greater infiltration and provide surface
storage. Pavement reduces infiltration and increases the proportion of rainfall
converted to surface runoff.
7. What is infiltration?
A. Movement of water across the ground surface
B. Movement of water from the ground surface into the soil
C. Movement of sediment through a pipe
D. Evaporation from a pond
Answer: B. Movement of water from the ground surface into the soil
Rationale: Infiltration is the process by which water enters the soil at the ground
surface. Infiltration capacity is influenced by soil properties, compaction, moisture
conditions, vegetation, and surface characteristics.
8. Which soil condition generally reduces infiltration?
, A. Well-aggregated soil
B. Dense vegetation
C. High organic matter
D. Heavy compaction
Answer: D. Heavy compaction
Rationale: Compaction reduces soil pore space and can restrict the movement of
water into the soil. Construction traffic and grading equipment can therefore
significantly reduce infiltration capacity.
9. What is runoff?
A. Water stored permanently below the ground
B. Water flowing over the land surface toward a drainage feature or receiving
water
C. Water removed exclusively by evaporation
D. Water contained within plant tissue
Answer: B. Water flowing over the land surface toward a drainage feature or
receiving water
Rationale: Surface runoff occurs when water flows across the land rather than
infiltrating, evaporating, or being otherwise retained. Stormwater management
controls are designed in part to manage this flow.
10. Which factor generally increases peak stormwater discharge from a
developed watershed?
A. Increased infiltration
B. Increased vegetative cover
C. Increased surface storage
D. Increased impervious area
Answer: D. Increased impervious area
Exam Questions and Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary purpose of stormwater management?
A. Increase the rate of surface runoff
B. Eliminate all stormwater from developed sites
C. Protect water quality and manage the quantity and effects of stormwater
runoff
D. Replace sanitary sewer systems
Answer: C. Protect water quality and manage the quantity and effects of
stormwater runoff
Rationale: Stormwater management addresses both water-quality and water-
quantity impacts associated with land development. Effective management
reduces pollutant transport and helps control increased runoff volume, velocity,
and peak flows.
2. What does impervious cover generally do to stormwater runoff?
A. It generally increases runoff volume and reduces infiltration.
B. It eliminates peak discharge.
C. It increases soil infiltration.
D. It prevents runoff from reaching receiving waters.
Answer: A. It generally increases runoff volume and reduces infiltration.
Rationale: Impervious surfaces such as roofs, parking lots, and pavement prevent
rainfall from infiltrating into the soil. More rainfall therefore becomes surface
runoff, often increasing runoff volume and peak discharge.
,3. Which document identifies the stormwater controls and pollution-prevention
practices to be implemented for a construction project?
A. Property deed
B. Building elevation plan
C. Stormwater Pollution Prevention Plan (SWPPP)
D. Construction payroll
Answer: C. Stormwater Pollution Prevention Plan (SWPPP)
Rationale: A SWPPP identifies potential sources of stormwater pollution and the
practices used to minimize pollutant discharge. For regulated construction
activities, it incorporates or references applicable erosion, sediment, stormwater,
and pollution-prevention requirements.
4. What is the primary distinction between an ESC plan and a post-construction
SWM plan?
A. ESC plans apply only to buildings.
B. SWM plans apply only to temporary sediment fences.
C. ESC plans address only water quality after construction.
D. ESC plans primarily address erosion and sediment during land disturbance,
while SWM planning addresses post-construction stormwater management.
Answer: D. ESC plans primarily address erosion and sediment during land
disturbance, while SWM planning addresses post-construction stormwater
management.
Rationale: Erosion and sediment controls protect disturbed soil and receiving
waters during construction. Stormwater management measures are designed to
address the longer-term water-quality and water-quantity effects of development.
5. What does BMP stand for in stormwater management?
A. Basin Management Procedure
B. Best Management Practice
,C. Building Maintenance Permit
D. Basic Monitoring Plan
Answer: B. Best Management Practice
Rationale: BMP means Best Management Practice. The term is broadly used for
structural and nonstructural practices designed to prevent, reduce, or manage
stormwater impacts.
6. Which stormwater characteristic is most directly affected when natural
vegetation is replaced by extensive pavement?
A. Soil color
B. Groundwater chemistry only
C. Runoff generation
D. Air temperature
Answer: C. Runoff generation
Rationale: Vegetated soils generally allow greater infiltration and provide surface
storage. Pavement reduces infiltration and increases the proportion of rainfall
converted to surface runoff.
7. What is infiltration?
A. Movement of water across the ground surface
B. Movement of water from the ground surface into the soil
C. Movement of sediment through a pipe
D. Evaporation from a pond
Answer: B. Movement of water from the ground surface into the soil
Rationale: Infiltration is the process by which water enters the soil at the ground
surface. Infiltration capacity is influenced by soil properties, compaction, moisture
conditions, vegetation, and surface characteristics.
8. Which soil condition generally reduces infiltration?
, A. Well-aggregated soil
B. Dense vegetation
C. High organic matter
D. Heavy compaction
Answer: D. Heavy compaction
Rationale: Compaction reduces soil pore space and can restrict the movement of
water into the soil. Construction traffic and grading equipment can therefore
significantly reduce infiltration capacity.
9. What is runoff?
A. Water stored permanently below the ground
B. Water flowing over the land surface toward a drainage feature or receiving
water
C. Water removed exclusively by evaporation
D. Water contained within plant tissue
Answer: B. Water flowing over the land surface toward a drainage feature or
receiving water
Rationale: Surface runoff occurs when water flows across the land rather than
infiltrating, evaporating, or being otherwise retained. Stormwater management
controls are designed in part to manage this flow.
10. Which factor generally increases peak stormwater discharge from a
developed watershed?
A. Increased infiltration
B. Increased vegetative cover
C. Increased surface storage
D. Increased impervious area
Answer: D. Increased impervious area
