IPC Storm Drainage Systems

Question 1

Per the IPC, what minimum slope is required for horizontal storm drain piping that is 3 inches or smaller in diameter?

Accepted Answer

1/4 inch per foot

Answer

The IPC requires a minimum slope of 1/4 inch per foot for horizontal storm drain piping 3 inches or smaller in diameter to ensure adequate flow velocity.

Question 2

According to the IPC, what is a 'conductor' in storm drainage terminology?

Accepted Answer

A pipe inside a building that conveys storm water from the roof drain to the building storm drain

Answer

A conductor is the vertical pipe located inside a building that carries storm water downward from the roof drain to the building storm drain.

Question 3

The IPC requires that roof drain strainers have a total inlet area of not less than:

Accepted Answer

1.5 times the area of the conductor pipe

Answer

IPC Section 1102.4 requires roof drain strainers to have a total inlet area not less than 1.5 times the cross-sectional area of the conductor to prevent flow restriction.

Question 4

Per the IPC, secondary (emergency) roof drainage systems are required when:

Accepted Answer

Overflow from blocked primary drains could cause structural damage or flooding of occupied areas

Answer

The IPC requires secondary roof drainage where overflow from blocked primary drains poses a risk of structural damage or flooding of occupied building spaces.

Question 5

Under the IPC, 'area drains' are receptors designed to collect storm water from:

Accepted Answer

Exterior paved areas, courts, and similar surfaces

Answer

Area drains are installed to collect and remove storm water from exterior paved or landscaped surfaces such as parking lots, driveways, and courtyards.

IPC - International Plumbing Code Practice Test

IPC - International Plumbing Code Practice Test

IPC Storm Drainage Systems