AZ L-83 Stormwater Systems
Contractor Exam Questions And
Correct Answers (Verified Answers)
Plus Rationale2026 Q&A| Instant
Download Pdf
1. What is the primary purpose of a stormwater system?
A. Transport sewage to treatment plants
B. Control and convey rainwater to prevent flooding
C. Provide drinking water
D. Generate hydroelectric power
Rationale: The main function of stormwater systems is to manage
runoff and prevent flooding, not handle sewage or potable water.
2. Which of the following is a common type of stormwater conveyance?
A. Gravity-fed sewer
B. Culverts
C. Septic tanks
D. Water towers
Rationale: Culverts are structures designed to convey stormwater
under roads or railways, making them a key component of
stormwater systems.
3. What is the purpose of detention basins in stormwater management?
A. Filter pollutants
B. Temporarily store runoff to reduce peak flow
C. Provide irrigation water
D. Supply drinking water
Rationale: Detention basins are designed to hold runoff temporarily
and release it slowly to reduce downstream flooding.
,4. Best management practices (BMPs) in stormwater management are
intended to:
A. Increase water pressure in pipes
B. Reduce pollutants and manage runoff
C. Generate electricity
D. Store drinking water
Rationale: BMPs are techniques or structures used to reduce
pollution and control stormwater runoff.
5. What is the primary design consideration for stormwater pipes?
A. Color of the pipe
B. Hydraulic capacity
C. Pipe manufacturer
D. Soil type only
Rationale: The hydraulic capacity determines how much runoff the
system can handle without overflowing.
6. When installing stormwater systems, what is a key factor for pipe
slope?
A. Visual appeal
B. Ensure proper flow velocity and prevent sediment deposition
C. Minimize construction cost
D. Soil type only
Rationale: Proper slope maintains adequate flow velocity to prevent
sedimentation or pipe blockage.
7. Which material is commonly used for stormwater pipes?
A. Steel
B. PVC
C. Wood
D. Copper
Rationale: PVC is widely used due to its durability, corrosion
resistance, and ease of installation.
8. What is the purpose of a stormwater manhole?
A. Store water for irrigation
B. Provide access for inspection and maintenance
C. Filter stormwater
D. Generate electricity
Rationale: Manholes allow personnel to access pipes for inspection,
cleaning, and repairs.
, 9. In stormwater management, infiltration systems are used to:
A. Transport water quickly to rivers
B. Allow runoff to percolate into the ground
C. Store potable water
D. Generate hydroelectric power
Rationale: Infiltration systems help reduce runoff and recharge
groundwater by allowing water to seep into the soil.
10. A catch basin is designed primarily to:
A. Treat wastewater
B. Collect debris and sediment from stormwater runoff
C. Provide irrigation water
D. Measure rainfall
Rationale: Catch basins remove sediment and debris before water
enters the stormwater system, reducing clogging.
11. Which of the following practices reduces the volume of
stormwater runoff?
A. Paving all surfaces
B. Installing permeable pavements
C. Increasing roof area
D. Building more roads
Rationale: Permeable pavements allow water to infiltrate, reducing
runoff volume.
12. Stormwater detention differs from retention in that detention:
A. Stores water permanently
B. Stores water temporarily
C. Provides drinking water
D. Treats sewage
Rationale: Detention basins temporarily hold water, while retention
basins store water indefinitely.
13. What is the main reason for using energy dissipation structures at
stormwater outlets?
A. Increase water speed
B. Reduce erosion at the outfall
C. Improve water clarity
D. Filter pollutants
Rationale: Energy dissipation structures slow water velocity to
prevent downstream erosion.
Contractor Exam Questions And
Correct Answers (Verified Answers)
Plus Rationale2026 Q&A| Instant
Download Pdf
1. What is the primary purpose of a stormwater system?
A. Transport sewage to treatment plants
B. Control and convey rainwater to prevent flooding
C. Provide drinking water
D. Generate hydroelectric power
Rationale: The main function of stormwater systems is to manage
runoff and prevent flooding, not handle sewage or potable water.
2. Which of the following is a common type of stormwater conveyance?
A. Gravity-fed sewer
B. Culverts
C. Septic tanks
D. Water towers
Rationale: Culverts are structures designed to convey stormwater
under roads or railways, making them a key component of
stormwater systems.
3. What is the purpose of detention basins in stormwater management?
A. Filter pollutants
B. Temporarily store runoff to reduce peak flow
C. Provide irrigation water
D. Supply drinking water
Rationale: Detention basins are designed to hold runoff temporarily
and release it slowly to reduce downstream flooding.
,4. Best management practices (BMPs) in stormwater management are
intended to:
A. Increase water pressure in pipes
B. Reduce pollutants and manage runoff
C. Generate electricity
D. Store drinking water
Rationale: BMPs are techniques or structures used to reduce
pollution and control stormwater runoff.
5. What is the primary design consideration for stormwater pipes?
A. Color of the pipe
B. Hydraulic capacity
C. Pipe manufacturer
D. Soil type only
Rationale: The hydraulic capacity determines how much runoff the
system can handle without overflowing.
6. When installing stormwater systems, what is a key factor for pipe
slope?
A. Visual appeal
B. Ensure proper flow velocity and prevent sediment deposition
C. Minimize construction cost
D. Soil type only
Rationale: Proper slope maintains adequate flow velocity to prevent
sedimentation or pipe blockage.
7. Which material is commonly used for stormwater pipes?
A. Steel
B. PVC
C. Wood
D. Copper
Rationale: PVC is widely used due to its durability, corrosion
resistance, and ease of installation.
8. What is the purpose of a stormwater manhole?
A. Store water for irrigation
B. Provide access for inspection and maintenance
C. Filter stormwater
D. Generate electricity
Rationale: Manholes allow personnel to access pipes for inspection,
cleaning, and repairs.
, 9. In stormwater management, infiltration systems are used to:
A. Transport water quickly to rivers
B. Allow runoff to percolate into the ground
C. Store potable water
D. Generate hydroelectric power
Rationale: Infiltration systems help reduce runoff and recharge
groundwater by allowing water to seep into the soil.
10. A catch basin is designed primarily to:
A. Treat wastewater
B. Collect debris and sediment from stormwater runoff
C. Provide irrigation water
D. Measure rainfall
Rationale: Catch basins remove sediment and debris before water
enters the stormwater system, reducing clogging.
11. Which of the following practices reduces the volume of
stormwater runoff?
A. Paving all surfaces
B. Installing permeable pavements
C. Increasing roof area
D. Building more roads
Rationale: Permeable pavements allow water to infiltrate, reducing
runoff volume.
12. Stormwater detention differs from retention in that detention:
A. Stores water permanently
B. Stores water temporarily
C. Provides drinking water
D. Treats sewage
Rationale: Detention basins temporarily hold water, while retention
basins store water indefinitely.
13. What is the main reason for using energy dissipation structures at
stormwater outlets?
A. Increase water speed
B. Reduce erosion at the outfall
C. Improve water clarity
D. Filter pollutants
Rationale: Energy dissipation structures slow water velocity to
prevent downstream erosion.
