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

1/8 inch per foot

Answer

1/2 inch per foot

Answer

1/16 inch per foot

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

An exterior vertical pipe that conveys storm water from the roof to grade

Answer

A horizontal pipe connecting multiple roof drains

Answer

A pipe that carries electrical current for water heating systems

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

The same area as the conductor pipe

Answer

Twice the area of the conductor pipe

Answer

Three times the area of the conductor pipe

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 roof area exceeds 5,000 square feet

Answer

All flat roofs regardless of size must have secondary drains

Answer

The building is located in a high-rainfall zone

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

Sanitary fixture discharge

Answer

Roof surfaces only

Answer

HVAC condensate equipment

Question 6

Per the IPC, the design rainfall intensity used for sizing storm drainage systems must be based on:

Accepted Answer

Rainfall data specific to the geographical location of the project

Answer

A uniform national standard of 4 inches per hour

Answer

The lowest recorded hourly rainfall rate in the region

Answer

The average annual rainfall divided by 8,760 hours

Question 7

What is a 'leader' in IPC storm drainage terminology?

Accepted Answer

An exterior vertical pipe or element that conveys storm water from the roof to the storm drain or grade

Answer

The main horizontal building storm drain pipe

Answer

An interior vertical pipe carrying roof water to the building drain

Answer

The licensed plumber responsible for inspections