Chapter 11: Storm Drainage

Where should stormwater be discharged according to regulations?

• a) Into a sanitary sewer

• b) Into an approved disposal point

• c) Into any open land area

• d) Into a septic tank

Which material is NOT approved for rainwater downspouts inside a vertical pipe chase?

• a) Cast iron

• b) Galvanized steel

• c) Polyvinyl chloride (PVC)

• d) Clay pipes

Downspouts for high-rise buildings must be made of stronger materials to resist:

• a) Earthquake shocks

• b) High hydrostatic pressure

• c) Wind loads

• d) Snow accumulation

Which of the following statements about rainwater piping is TRUE?

• a) Rainwater piping can be used as a vent pipe

• b) Rainwater piping must be tested and accepted before use

• c) Rainwater piping should be connected to wastewater pipes

• d) Rainwater piping should always be made of copper

How high should dome-type strainers extend above the roof surface?

• a) At least 25 mm

• 
  b) At least 50 mm

• c) At least 100 mm

• d) Flush with the roof surface

What type of roof drain strainer is required for sun decks and parking decks?

• a) Dome-type

• b) Flat-surface type

• c) Funnel-type

• d) Mesh-type

What is the standard rainfall intensity used for pipe sizing in Metro Manila?

• a) 50 mm/hour

• b) 76 mm/hour

• c) 102 mm/hour

• d) 127 mm/hour

If a vertical wall projects above a roof and drains onto it, what percentage of the wall area should be added to the roof area?

• a) 25%

• b) 50%

• c) 75%

• d) 100%

• If two adjacent walls drain onto a lower roof, how much of the total wall area is added to the roof area?
  

• • a) 25%

• • b) 35%

• • c) 50%

• • d) 75%

When two opposite walls of equal height drain onto a roof, how much wall area is added?

• a) 0%

• b) 25%

• c) 50%

• d) 75%