Collection Systems
Distribution Systems
Grab Bag!
Clean Water (WW)
Water
100
What is the cross-sectional area of a
24-inch pipe in square feet?
What is 3.14 ft2?
100
Hypochlorite (mg/L) in a solution of 63% calcium hypochlorite.
What is 635,000 mg/L?
100
Odorless, tasteless, and can cause asphyxiation by displacing oxygen from the air in confined spaces.
What is carbon monoxide?
100
Centrifugal and vertical turbines are what kind of pumps?
What is velocity pumps?
100
The type of fire extinguisher should be used on electrical fires.
What is class C or carbon dioxide?
200
Name at least 2 types of lift stations.
What are
Wet Well/Dry Well
Pneumatic Ejector
Submersible
200
200
The lowest point in the channel.
What is invert?
200
A channel is 7 ft wide has water flowing to a depth of 3 ft and a velocity of 2.8 fps. The flow through the channel in cfs is ___.
What is 59 cfs.
200
Chemical that will raise the pH of water.
(ferric sulfate, soda ash, or carbon dioxide)
What is soda ash?
300
The velocity, in feet/sec,
of an 18-inch pipe that is flowing full at
a rate of 2 ft3/sec?
What is 1.13 ft/sec?
300
Which of the following valve types is the most suitable for a throttling application (butterfly valve, check valve, gate valve).
What is a butterfly valve?
300
The two most important factors of effective chlorination.
What are
Concentration
&
Contact Time
300
Two common methods of supplying oxygen to the microorganisms.
What are:
Mechanical Aeration
Diffused Air Systems
300
The three things that a water system must have in order to safely handle chlorine gas.
What are:
SCBA
A Repair Kit
&
Ventilation/Detectors
400
The typical design flow
(in gal/person/day)
used for a domestic collection system?
What is 100 gal/person/day?
400
Convert 8.60 MGD into cfs (cubic ft/sec or ft3/sec).
What is 13.3 cfs?
400
The size of water mains, pump stations, and tanks is primarily determined by this.
What is fire protection?
400
400
According to the Interim Surface Water Treatment Rule, a public water system must maintain the combined effluent turbidity less than or equal to _______NTU in 95% of measurements taken each month.
What is 0.3 NTU?
500
It occurs if the flow in a collection system is 2 ft/sec or greater.
What is scouring?
500
The maximum theoretical suction of a centrifugal pump at sea level.
What is 34'?
500
A mixture of grit and large quantities of organic matter.
What is Detritus?
500
Secondary treatment is this type of process (physical, chemical or biological?)
What is biological?
500
A pump in continuous service should be inspected for cleanliness and leakage this often.
What is daily?