Stormwater Drainage Systems Compliance and Documentation Quiz

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.