Installation and maintenance of foul water drains

What is the minimum thickness of compacted granular bedding needed beneath a drain according to G13/AS2?

• 150mm

• 75mm

• 50mm

• 100mm

Which of the following is NOT a type of drainage right?

• Legally laid drains

• Way-leaves

• Drainage permits

• Easements

What is the purpose of thrust blocks in a drainage system?

• To mark the location of underground pipes

• To provide extra insulation to the pipes

• To prevent tree roots from entering the pipes

• To support pipework and protect it from stress when there is a horizontal change of direction

What is the minimum gradient allowed for a 100mm drain according to G13/AS2?

• 1:120

• 1:60

• 1:80

• 1:40

Which of the following materials is NOT mentioned as suitable for bedding and backfill?

• Clay

• Concrete

• Quarry dust

• Sand

What is the function of anti-scour blocks?

• To provide additional insulation to pipes

• To mark the location of underground pipes

• To prevent tree roots from entering the pipes

• To support pipework in unstable ground and prevent erosion

What is the minimum thickness of an anchor block for pipework that is 150mm in diameter or less?

• 200mm

• 150mm

• 250mm

• 100mm

What is the purpose of a Project Information Memorandum (PIM)?

• To grant permission for excavation work

• To record the ownership of the drainage system

• To certify the quality of the drainage materials used

• To provide information about the property and any conditions required by the local territorial authority

What is the minimum depth of cover needed above a pipe to avoid damage?

• 200mm

• 300mm

• 400mm

• 500mm

What is the minimum diameter of a main drain vent according to AS/NZS 3500.2?

• 40mm

• 50mm

• 80mm

• 65mm