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2024 International Plumbing Code - Residential
Chapter 11: Storm Drainage

Quiz: 2024 International Plumbing Code - Residential Chapter 11: Storm Drainage

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1. For a one-family dwelling, storm water is permitted to discharge onto a lawn under which condition?

The lawn is at least 50 feet from the property line
The discharge is approved and flows away from the building
The soil is classified as type A or B by a geo-technical engineer
The roof area is less than 1,000 square feet

2. Into which type of system is the drainage of storm water strictly prohibited?

Approved dry wells
Combined sewer systems
Sewers intended for sewage only
Subsoil drainage sumps

3. What is the restriction regarding the size of a storm drainage pipe in the direction of flow?

It must increase by at least one pipe size every 50 feet
It shall not be reduced in the direction of flow
It may only be reduced if the slope increases to 1/2 inch per foot
It must remain the same diameter throughout the building

4. When determining the maximum possible depth of water for roof design, which of the following must be assumed?

The secondary drainage system is blocked
A 500-year rainfall event is occurring
All primary roof drainage means are blocked
The roof is perfectly level with no deflection

5. Which of the following storm drainage systems is exempt from the requirement to install cleanouts?

Inside storm drainage conductors
Building storm sewers
Underground building storm drains
Subsurface drainage systems

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