CSLB C-36 Plumbing ContractorRough-in PlumbingMedium
A plumbing contractor is installing a new underground storm drainage system for a commercial building. The storm drain pipe runs beneath a heavily trafficked parking lot. What is the minimum cover required for a 6-inch storm drain pipe installed in this location?
- A18 inches
- B12 inches
- C36 inches
- D24 inches
Show answer & explanationAnswer & explanation
Correct answer: C. 36 inches
Under heavily trafficked areas like parking lots, storm drain pipes require significant cover to protect them from crushing loads. The minimum cover for such conditions is typically 36 inches (3 feet) to ensure durability and prevent damage.
Why the other options are wrong
- A. This cover might be acceptable for non-traffic areas, but not under heavy vehicular loads.
- B. This cover is generally insufficient for pipes under heavy traffic.
- D. While better than shallower options, 24 inches is often not enough for heavy traffic areas.
Underground Storm Drain Cover (Traffic)
The minimum depth of soil or fill required above an underground storm drain pipe to protect it from vehicular loads, especially in heavily trafficked areas like parking lots.
- Prevents pipe crushing and damage.
- Depth depends on traffic load and pipe material.
- Greater cover needed for heavy traffic.
Memory trick: Heavy Traffic needs 'Deep Protection' for pipes.