IPC Storm Drainage Systems 2

Question 1

Per the IPC, what is the minimum allowable size for a roof drain?

Accepted Answer

3 inches

Answer

2 inches

Answer

4 inches

Answer

The size must equal the conductor diameter

Question 2

Under the IPC, horizontal storm drainage piping larger than 3 inches in diameter must have a minimum slope of:

Accepted Answer

1/8 inch per foot

Answer

1/16 inch per foot

Answer

3/8 inch per foot

Answer

1/4 inch per foot

Question 3

According to the IPC, are combined sanitary and storm drainage systems permitted in new construction?

Accepted Answer

No, except where specifically approved by the administrative authority

Answer

Yes, always permitted to reduce installation cost

Answer

Yes, but only for one- and two-family dwellings

Answer

No, and no exceptions exist under any circumstances

Question 4

Per the IPC, subsoil (foundation) drainage systems must discharge to:

Accepted Answer

An approved location such as a storm drain, combined sewer (where approved), or daylight

Answer

The sanitary building drain only

Answer

The public sanitary sewer at all times

Answer

A sump pit connected to the sanitary drain

Question 5

When sizing a storm drainage system under the IPC, which of the following factors is NOT used to calculate drain pipe sizes?

Accepted Answer

Soil percolation rate

Answer

Rainfall intensity in inches per hour

Answer

Drainage area in square feet

Answer

Horizontal pipe slope

Question 6

Under the IPC, when a roof has expansion joints, roof drains must be installed:

Accepted Answer

On each side of every expansion joint

Answer

Only at the lowest point of the entire roof

Answer

With a single oversized drain at the center of the roof

Answer

With flexible connectors that span the joint

Question 7

Per the IPC, a trap is required on a storm drain conductor when it connects to:

Accepted Answer

A combined sanitary and storm sewer

Answer

Any roof drain regardless of the sewer type

Answer

A storm-only sewer system

Answer

Any underground piping system