Drainage Starter Quiz

Which part of the soil stack is described as the "lower, wet part"?

• The soil pipe

• The vent pipe

• The heating pipe

• The drainage pipe

Why should drainage be provided for all water supply points inside a building?

• To increase water pressure

• To prevent flooding

• To reduce water usage

• To improve water quality

What is the minimum depth of water seal in a trap?

• 25mm

• 50mm

• 75mm

• 100mm

What is the waste size for a washing machine or dishwasher?

• 32 mm

• 40 mm

• 75 mm

• 100 mm

What is the gradient for a WC?

• 18 mm/m

• 18-22 mm/m

• 18-90 mm/m

• 22 mm/m

What is the trap seal depth for a WC?

• 50 mm

• 75 mm

• 100 mm

• 60 mm

What is the trap seal depth for a washing machine or dishwasher?

• 50 mm

• 75 mm

• 100 mm

• 60 mm

Where are junior WCs often installed?

• High schools

• Colleges

• Nursery and infant schools

• Universities

If an installation exceeds the maximum length, what should be done to the pipe size?

• Decrease the pipe size

• Use the same pipe size

• Use the next pipe size up

• Use a smaller pipe size

What is the minimum pipe size that should be used if multiple appliances are connected to a single discharge pipe?

• 40mm

• 45mm

• 50mm

• 55mm