Sanitary Drainage, Indirect Waste Systems and Storm Drainage

Question 1

True or False:

Buildings on separate properties can share a connection to the public sewer.

Answer 1

False

Question 2

What material is not approved for underground building drainage and vent piping?

Answer 2

glass

Question 3

What is the minimum slope for a horizontal pipe that is 2 inches in diameter?

Answer 3

1/4” per foot

Question 4

What is the minimum slope for a horizontal pipe that is 4 inches in diameter?

Answer 4

1/8” per foot

Question 5

True or False:

Primer is not required for PVC drainage, waste and vent pipe, and fittings in non-pressure applications up to 4” pipe.

Answer 5

True

Question 6

Fill in the blank:

Horizontal drainage pipes in buildings shall have cleanouts located at intervals of not more than ______ feet.

Answer 6

100

Question 7

What size cleanout is required for a 3” pipe?

Answer 7

3 inches

Question 8

A cleanout plug for plastic pipe is required to be which type?

Answer 8

plastic

Question 9

Fill in the blank:

Cleanouts for 4-inch pipe shall be provided with a clearance of not less than ______ inches.

Answer 9

18

Question 10

What is the drainage fixture unit value for a residential clothes washer?

Answer 10

2

Question 11

What is the drainage fixture unit value for a service sink?

Answer 11

2

Question 12

What is the minimum trap size for a kitchen sink?

Answer 12

1 1/2”

Question 13

What pipe size is required for a building drain carrying 200 DFU if the pipe has 1/4” per foot slope?

Answer 13

4 inches

Question 14

What are the maximum drainage fixture units for a 6” building drain having a slope of 1/4” per foot?

Answer 14

840

Question 15

What is the required pipe size for a vertical stack with the discharge from one branch interval carrying 18 drainage fixture units?

Answer 15

3 inches

Question 16

What is the required pipe size for a vertical stack with the discharge from three branch intervals carrying 200 drainage fixture units?

Answer 16

4 inches

Question 17

What is the required pipe size for a vertical stack with the discharge from 5 branch intervals carrying 1200 drainage fixture units?

Answer 17

6 inches

Question 18

What is the minimum depth of a sump pit for a sewage ejector?

Answer 18

24 inches

Question 19

Fill in the blank:

The discharge line connection from a sump or ejector to a horizontal drainage pipe shall be located not less than ______ pipe diameters from other stacks or drains.

Answer 19

10

Question 20

What is the largest drain size that can be replaced by pipe-bursting methods?

Answer 20

6 inches

Question 21

What is not a concern that indirect waste connections are designed to protect devices and appliances from?

Answer 21

malfunction

Question 22

Fill in the blank:

Food handling equipment and fixtures shall discharge through an indirect waste connection by means of ______.

Answer 22

an air gap

Question 23

Fill in the blank:

Floor drain located in walk-in refrigerators shall discharge through an indirect waste connection by means of ______.

Answer 23

an air gap

Question 24

Fill in the blank:

The discharge from commercial dishwashers shall discharge through an indirect waste connection by means of ______.

Answer 24

either air gap or air break

Question 25

What is the maximum developed length for a pipe measured horizontally running from a fixture to an indirect waste location?

Answer 25

30 inches

Question 26

What is the maximum total developed length for a pipe running from a fixture to an indirect waste location?

Answer 26

54 inches

Question 27

# True or False: Waste receptors for indirect waste shall be permitted in concealed spaces such as crawl spaces, attics, or plenums.

Answer 27

False

Question 28

# Fill in the blank: A hub drain acting as an indirect waste receptor shall extend not less than \_\_\_\_\_\_ above the floor.

Answer 28

1 inch

Question 29

# Fill in the blank: Standpipes intended for indirect waste shall not extend less than \_\_\_\_\_\_ inches above the trap weir.

Answer 29

18 inches

Question 30

# True or False: A laundry tray is permitted to be connected directly to a washer standpipe above the trap.

Answer 30

True

Question 31

# True or False: Stormwater shall be drained into sewers intended for sewage only.

Answer 31

False

Question 32

# True or False: Materials and methods for storm drainage shall be the same as applicable requirements for sanitary drainage systems in Chapter 7.

Answer 32

True

Question 33

# True or False: Floor drains shall be permitted to be connected to storm drains.

Answer 33

False

Question 34

# Fill in the blank: The size of storm drain piping shall be based on \_\_\_\_\_\_.

Answer 34

gallons per minute flow through the roof drain

Question 35

Solve for the gallon per minute flow for a roof surface that is 8,000 square feet at a location with 3.25 inches of rainfall intensity per hour.

Answer 35

270

Question 36

What is the gallon per minute capacity of a vertical leader that is 3"?

Answer 36

92

Question 37

What is the gallon per minute capacity of a vertical leader that is 4"?

Answer 37

192

Question 38

What size of storm drain pipe should be installed for a horizontal roof drain that has a slope of 1/8" per foot and a gallon per minute flow of 100 GPM?

Answer 38

4 inches

Question 39

What size of storm drain pipe should be installed for a horizontal roof drain that has a slope of 1/8" per foot and a gallon per minute flow of 300 GPM?

Answer 39

6 inches

Question 40

What size of storm drain pipe should be installed for a vertical roof drain that has a gallon per minute flow of 450 GPM?

Answer 40

6 inches

Question 41

What size is the horizontal gutter if the slope is 1/8" per foot and the flow rate is 39 GPM?

Answer 41

4 inches

Question 42

What size is the horizontal gutter if the slope is 1/8" per foot and the flow rate is 98 GPM?

Answer 42

6 inches

Question 43

What is the minimum opening dimension for a scupper for a secondary roof drain?

Answer 43

4 inches

Question 44

# Fill in the blank: Control devices for flow-controlled roof drain systems shall be protected \_\_\_\_\_\_.

Answer 44

by strainers

Question 45

What is the minimum diameter for a storm or ground water sump pit?

Answer 45

18 inches