AWWA AWWA Water Distribution Systems 1

Question 1

According to AWWA standards, what is the minimum residual chlorine level recommended at the extremities of a water distribution system?

Accepted Answer

0.1 mg/L

Answer

AWWA recommends maintaining a minimum residual chlorine of 0.1 mg/L at the extremities of the distribution system to prevent microbial regrowth.

Question 2

What type of valve is most commonly used for mainline isolation in a water distribution system per AWWA C509?

Accepted Answer

Gate valve

Answer

AWWA C509 covers resilient-seated gate valves, which are the most commonly specified mainline isolation valves in water distribution systems.

Question 3

Per AWWA guidelines, how often should fire hydrants be flow-tested to verify system pressure and flow capacity?

Accepted Answer

Annually

Answer

AWWA recommends annual flow testing of fire hydrants to ensure adequate system pressure and flow capacity are maintained.

Question 4

What is the standard pipe pressure class requirement for ductile iron pipe used in water distribution per AWWA C151?

Accepted Answer

Class 350

Answer

AWWA C151 specifies ductile iron pipe pressure classes; Class 350 is one of the highest-rated standard classes used for high-pressure distribution mains.

Question 5

Which AWWA standard covers the installation of water mains?

Accepted Answer

AWWA C600

Answer

AWWA C600 is the standard for installation of ductile-iron mains and their appurtenances, covering bedding, jointing, and pressure testing.

(AWWA) American Water Works Association Practice Test

(AWWA) American Water Works Association Practice Test

AWWA AWWA Water Distribution Systems 1