CME Urban Infrastructure Design & Development 3 — Questions and Answers
Question 1: What is the primary function of a lift station (pump station) in a municipal sewer system?
- To treat sewage before discharge
- To pump sewage from lower to higher elevations where gravity flow is not feasible (Correct answer)
- To separate storm and sanitary flows
- To meter flow rates entering a treatment plant
Correct answer: To pump sewage from lower to higher elevations where gravity flow is not feasible
Lift stations use pumps to move sewage uphill when the terrain prevents gravity flow to the wastewater treatment facility.
Question 2: Which federal act primarily governs the quality of drinking water in US municipal systems?
- Clean Water Act
- Safe Drinking Water Act (Correct answer)
- Resource Conservation and Recovery Act
- National Environmental Policy Act
Correct answer: Safe Drinking Water Act
The Safe Drinking Water Act (SDWA) of 1974 authorizes EPA to set standards for drinking water quality in public water systems.
Question 3: In roadway design, what does the 'level of service' (LOS) metric primarily measure?
- Pavement structural condition
- Quality of traffic flow and driver experience on a roadway (Correct answer)
- Road surface friction coefficient
- Number of lanes on a highway
Correct answer: Quality of traffic flow and driver experience on a roadway
LOS is a qualitative measure (A through F) describing operating conditions in a traffic stream, with A being free flow and F representing breakdown.
Question 4: What is the purpose of a retention pond in urban stormwater management?
- To permanently store water and release it slowly through evaporation and infiltration (Correct answer)
- To temporarily detain runoff and release it at a controlled rate post-storm
- To filter sediment using sand media
- To convey stormwater rapidly to receiving waters
Correct answer: To permanently store water and release it slowly through evaporation and infiltration
Retention ponds permanently hold water and manage stormwater through evaporation, infiltration, and plant uptake rather than discharging to outfall.
Question 5: Which geotechnical test is most commonly used to evaluate subgrade soil bearing capacity for pavement design?
- Standard Proctor Test
- California Bearing Ratio (CBR) Test (Correct answer)
- Atterberg Limits Test
- Grain Size Analysis
Correct answer: California Bearing Ratio (CBR) Test
The CBR test measures the shear strength of subgrade soils relative to crushed stone, providing a key input for flexible pavement thickness design.
Question 6: What is a 'right-of-way' (ROW) in municipal infrastructure terms?
- The priority given to emergency vehicles at intersections
- The legal authority to construct and maintain infrastructure on public or private land (Correct answer)
- The speed priority assigned to through traffic over turning movements
- A permit allowing temporary lane closures during construction
Correct answer: The legal authority to construct and maintain infrastructure on public or private land
ROW is the legal right to use land for public infrastructure such as streets, utilities, and transit, either owned by the municipality or obtained through easement.
Question 7: Which type of intersection control is most appropriate for low-volume, low-speed urban intersections to reduce severe right-angle crashes?
- Traffic signal
- Multi-lane roundabout
- Single-lane roundabout (Correct answer)
- Stop-controlled intersection
Correct answer: Single-lane roundabout
Single-lane roundabouts reduce severe right-angle and head-on conflicts by converting them to lower-speed sideswipe angles, making them effective at low-volume intersections.
CME Urban Infrastructure Design & Development 3
What is the primary function of a lift station (pump station) in a municipal sewer system?