Water Supply Systems Flashcards
6 cards from real 306A practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Water Supply Systems flashcards as text
What is the maximum water flow rate allowed for a residential lavatory faucet under Canadian water efficiency standards?
Answer: 5.7 L/min (1.5 gpm)
Current Canadian water efficiency standards limit residential lavatory faucets to 5.7 L/min (1.5 gpm), promoting water conservation without compromising usability.
What is the purpose of a vacuum breaker on a hose bibb?
Answer: To prevent backflow of contaminated water if the hose end is submerged
A vacuum breaker on a hose bibb prevents contaminated water from being siphoned back into the potable water supply if the hose end is submerged in a pool, puddle, or container of chemicals.
What is the standard colour coding for hot and cold water supply piping in Canada?
Answer: Red for hot, blue for cold
The standard colour coding in Canada uses red marking or insulation for hot water supply and blue for cold water supply, ensuring quick identification during maintenance and emergencies.
What is the maximum permitted flush volume for a residential water closet under current Canadian standards?
Answer: 6.0 L per flush
Current Canadian standards mandate a maximum of 6.0 L per flush for single-flush toilets, though many high-efficiency models now use 4.8 L or dual-flush systems using 3/6 L.
Why must an air gap be maintained between a potable water outlet and the flood level rim of a fixture?
Answer: To provide the most reliable form of backflow prevention
An air gap is the most reliable form of backflow prevention because it creates a physical separation between the potable water supply and potentially contaminated water. No mechanical device can match its reliability since there are no moving parts to fail.
What happens if a water supply system is not properly balanced in a multi-storey building?
Answer: Lower floors receive excessive pressure while upper floors have inadequate pressure
In a multi-storey building, hydrostatic pressure adds approximately 10 kPa per metre of elevation. Without pressure regulation, lower floors receive excessively high pressure while upper floors may have inadequate pressure for proper fixture operation.