Post-Construction Stormwater
Management Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationale 2026 Q&A| Instant
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1.Which of the following is the primary objective of post-construction
stormwater management?
A. Increase stormwater runoff rates to reduce flooding downstream
B. Maintain or restore pre-development hydrology by managing runoff
quantity and quality
C. Eliminate all vegetation from developed sites
D. Direct stormwater into sanitary sewer systems
Rationale: The primary goal of post-construction stormwater management
is to mimic natural hydrologic conditions by reducing runoff volume, peak
flow, and pollutant loading through long-term stormwater control
measures.
2. Which stormwater practice is designed primarily to promote
infiltration into underlying soils?
A. Concrete drainage channel
B. Bioretention cell (rain garden)
C. Storm sewer inlet
D. Curb and gutter
,Rationale: Bioretention cells temporarily store runoff and allow water to
infiltrate through engineered soils while filtering pollutants before
reaching groundwater or drainage systems.
3. Which pollutant is commonly associated with stormwater runoff from
parking lots?
A. Chlorine gas
B. Oil, grease, and heavy metals
C. Radioactive waste
D. Sulfur dioxide
Rationale: Vehicle leaks, tire wear, and brake dust contribute
hydrocarbons and heavy metals that are commonly transported by runoff
from paved parking areas.
4. Which of the following best describes impervious surfaces?
A. Areas covered with dense vegetation
B. Surfaces that completely absorb rainfall
C. Surfaces that prevent infiltration of water into the soil
D. Areas consisting entirely of wetlands
Rationale: Impervious surfaces such as roofs, roads, and sidewalks prevent
rainfall from infiltrating into the ground, increasing runoff volume and
velocity.
5. Which Low Impact Development (LID) practice reduces runoff by
storing rainfall on rooftops?
A. Riprap channel
B. Detention basin
C. Green roof
D. Culvert
, Rationale: Green roofs retain rainfall, promote evapotranspiration, reduce
runoff volume, and improve water quality while providing additional
environmental benefits.
6. What is the primary function of a detention basin?
A. Permanently store drinking water
B. Temporarily store runoff and release it at a controlled rate
C. Recharge groundwater directly through open wells
D. Eliminate the need for drainage systems
Rationale: Detention basins reduce peak discharge rates by temporarily
storing stormwater before gradually releasing it to downstream systems.
7. What distinguishes a retention basin from a detention basin?
A. Retention basins never receive stormwater
B. Detention basins permanently hold water
C. Retention basins maintain a permanent pool of water
D. Retention basins are used only during construction
Rationale: Retention basins contain a permanent water pool that provides
water quality treatment and additional storage during storm events.
8. Which best management practice (BMP) is most effective for filtering
sediments and nutrients from sheet flow?
A. Asphalt pavement
B. Vegetated filter strip
C. Concrete swale
D. Storm drain
Rationale: Vegetated filter strips slow runoff, promote infiltration, and
trap sediment and nutrients before runoff reaches receiving waters.
9. Which maintenance activity is essential for preserving BMP
effectiveness?
Management Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationale 2026 Q&A| Instant
Download Pdf
1.Which of the following is the primary objective of post-construction
stormwater management?
A. Increase stormwater runoff rates to reduce flooding downstream
B. Maintain or restore pre-development hydrology by managing runoff
quantity and quality
C. Eliminate all vegetation from developed sites
D. Direct stormwater into sanitary sewer systems
Rationale: The primary goal of post-construction stormwater management
is to mimic natural hydrologic conditions by reducing runoff volume, peak
flow, and pollutant loading through long-term stormwater control
measures.
2. Which stormwater practice is designed primarily to promote
infiltration into underlying soils?
A. Concrete drainage channel
B. Bioretention cell (rain garden)
C. Storm sewer inlet
D. Curb and gutter
,Rationale: Bioretention cells temporarily store runoff and allow water to
infiltrate through engineered soils while filtering pollutants before
reaching groundwater or drainage systems.
3. Which pollutant is commonly associated with stormwater runoff from
parking lots?
A. Chlorine gas
B. Oil, grease, and heavy metals
C. Radioactive waste
D. Sulfur dioxide
Rationale: Vehicle leaks, tire wear, and brake dust contribute
hydrocarbons and heavy metals that are commonly transported by runoff
from paved parking areas.
4. Which of the following best describes impervious surfaces?
A. Areas covered with dense vegetation
B. Surfaces that completely absorb rainfall
C. Surfaces that prevent infiltration of water into the soil
D. Areas consisting entirely of wetlands
Rationale: Impervious surfaces such as roofs, roads, and sidewalks prevent
rainfall from infiltrating into the ground, increasing runoff volume and
velocity.
5. Which Low Impact Development (LID) practice reduces runoff by
storing rainfall on rooftops?
A. Riprap channel
B. Detention basin
C. Green roof
D. Culvert
, Rationale: Green roofs retain rainfall, promote evapotranspiration, reduce
runoff volume, and improve water quality while providing additional
environmental benefits.
6. What is the primary function of a detention basin?
A. Permanently store drinking water
B. Temporarily store runoff and release it at a controlled rate
C. Recharge groundwater directly through open wells
D. Eliminate the need for drainage systems
Rationale: Detention basins reduce peak discharge rates by temporarily
storing stormwater before gradually releasing it to downstream systems.
7. What distinguishes a retention basin from a detention basin?
A. Retention basins never receive stormwater
B. Detention basins permanently hold water
C. Retention basins maintain a permanent pool of water
D. Retention basins are used only during construction
Rationale: Retention basins contain a permanent water pool that provides
water quality treatment and additional storage during storm events.
8. Which best management practice (BMP) is most effective for filtering
sediments and nutrients from sheet flow?
A. Asphalt pavement
B. Vegetated filter strip
C. Concrete swale
D. Storm drain
Rationale: Vegetated filter strips slow runoff, promote infiltration, and
trap sediment and nutrients before runoff reaches receiving waters.
9. Which maintenance activity is essential for preserving BMP
effectiveness?
