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WorksheetsStormwater Drainage Systems Compliance and Documentation Quiz
Total questions: 15
Worksheet time: 5mins
Which of the following is a consequence of having a flatter roof?
Water runs off more quickly.
Water is more likely to be retained or absorbed by the roof material.
There is less water loss through evaporation.
Water collection is greater.
Why does a steeper roof slope result in greater water collection?
Because it slows down the water flow.
Because it increases water concentration and collection.
Because it absorbs more water.
Because it reduces wind exposure.
Which weather condition during rainfall can reduce the amount of water entering a rainfall collection system from roofs?
Windy conditions
Cold conditions
Foggy conditions
Snowy conditions
What is a possible effect of sunny conditions after rainfall on water run-off?
Increased evaporation before run-off reaches the collection system
Increased rainfall
Decreased wind speed
More water entering the collection system
According to the Lysaght Referee, what factors can vary in sheet runs?
Slope and rainfall intensity
Color and material
Length and width
Cost and manufacturer
If you were to size a roof drainage system, which reference could you use for examples of sheet runs with different slopes and rainfall intensities?
Lysaght Referee
Building Code of Australia
Local weather report
Manufacturer’s warranty
Which of the following is NOT a method by which rainwater falling on a roof may be managed?
Draining off the roof freely, without gutters or other devices
Being led to a gutter, where it flows to a downpipe
Being directed to a roof-drainage device by means of slope in the roof
Being stored on the roof to increase ponding
If a building’s drainage system is blocked, what is a possible consequence for the structure?
Ceiling collapse
Improved insulation
Reduced humidity
Lower energy costs
What is the main purpose of using statistics on typical rainfall intensities when designing gutters and downpipes?
To help designers size gutters and downpipes appropriately
To determine the color of the gutters
To decide the building material for the roof
To estimate the cost of construction
What is the purpose of providing drainage slots along the front face of deep profile eave fascia gutters?
To avoid overflow from the back of the gutter into the eave space.
To increase the aesthetic appeal of the gutter.
To make the gutter easier to install.
To reduce the weight of the gutter.
According to the guidelines, what is the minimum cross-sectional area required for internal box gutters?
More than 15000 mm²
Less than 10000 mm²
Exactly 12000 mm²
More than 20000 mm²
Eaves gutter sizes are determined based on rainfall intensities for what overflow risk?
1 in 20 years
1 in 10 years
1 in 50 years
1 in 100 years
Which of the following is a recommended practice to reduce contaminants in rainwater collected from roofs?
Installing filters between the roof and the storage tank
Painting the roof with any available paint
Using untreated wood for gutters
Collecting water only during winter
A builder is deciding between using concrete, brick, or stone for an underground tank. What factors should they consider regarding the sealing and lining of the tank to ensure water safety and quality?
The ability of the material to be sealed and compatibility with effective liners like polythene
The color of the material
The cost of paint only
The size of the tank
Why must the access opening for inspection on the top of a tank be located above ground level?
To prevent water entry
To make it easier to find
To reduce the cost of the tank
To allow animals to access the tank
