UTA5 Water Treatment & Purification Flashcards
A total of how many gallons per minute are flowing in a stream that is 10 feet wide and has an average depth of 3 feet when the water is flowing at a velocity of 15 feet per minute?
Q=6.4 x A x V
Q=6.4 x (3x10) x 15
Q=6.4 x 30 x 15
Q= 2,880
The strainer on a suction hose should be placed a total of how many inches under the water level?
4
What is the purpose of a jar test?
To indicate what chemical is necessary for coagulation
Water produced by distillation equipment should NOT be used for what purpose? A. Fire protection B. Vehicle washing C. Galley scrubbing D. Personal cleanliness
A. Fire protection
What term is used to describe a water source developed for military use?
Water point
Compute the quantity of water in a lake that is 100 feet long, 20 feet wide, has an average depth of 6 feet, and no run off.
Q = A x D x 7.5
Q = (100 x 20) x 7 x 7.5
Q = 2000 x 7 x 7.5
Q = 90,000 gallons
Which of the following types of sand provides the greatest rate of flow during drawdown?
Coarse sand with grains nearly uniform in size
The pump and power unit used for testing a well should be capable of continuous operation for a minimum of how many hours?
24
What are the two classifications of water impurities?
Suspended or dissolved
What data, if any, should you study to determine the variation in reliability that may be expected at a water source?
Geological
A temporary water source should not be converted into a permanent water source until after what activity has taken place?
An area search for a source requiring less development
For a normal field water supply, what type of water source is the most accessible?
Surface
In a swiftly flowing stream, what type of dam can be constructed to protect an intake screen without impounding the water?
Wing or baffle dam
The quality of water from a muddy stream can be improved in which of the following ways?
By building intake galleries
Moisture is held beneath the surface of the earth in what total number of zones?
Three
Soil
Aeration/ percolation
Saturation
In a driven well, the sections of well pipe are delivered in lengths of what size?
5 feet
When developed properly, springs yielding a minimum of how many gallons per minute can be used as a source of field water?
20 Gallons
There is a total of how many classifications of wells?
5
(1) Dug
(2) Bored
(3) Driven
(4) Jetted
(5) Drilled
A well that is dug is usually 3 feet in diameter or more and within what depth range?
20’ to 40’
A well can normally be bored within what maximum depth without fear of a cave- in?
60’
25’ minimum
When jetting a well, you turn the jet or drill slowly for what purpose?
To ensure the hole is straight
When a well is driven, the drive points are within what size range?
1 1/4 inches to 2 inches
To guard against subsurface contamination, you should locate rainwater catchment areas at what minimum distance from possible sources of contamination?
100 feet
What minimum treatment is required for collected rainwater that is to be used as a water source?
Filtration and disinfection
A total of how many cubic feet of snow is required to produce 1 cubic foot of water?
5
Which of the following chemicals can be used to prevent the formation of algae in raw water supply points? A. Chlorine B. Copper sulfate C. Activated carbon D. Each of the above
D. Each of the above
What term accurately describes a muddy or unclear condition of water caused by sand, clay, or organic matter?
Turbidity
To treat 1,000 gallons of water, you should use approximately how many ounces of activated carbon?
1
When you are using copper sulfate to treat a lake, concentrations of organisms should never exceed how many parts per million to protect the lives of fish?
2
You should reduce the water treatment rate when the outside temperature reaches what level?
Less than 45°F
The total concentration of manganese in potable water should not exceed how many parts per million?
0.3
The ion exchange unit removes which of the following undesirable properties of water?
Manganese and lead
Dissolved gases can be removed from a water supply by what means?
Aeration
OR
Activated carbon
A water source with a pH value less than what number is an indication of possible CBR contamination?
5.0
What water test kit does medical use to check a water source for chemical contamination?
M272
What is the name of the process whereby latent heat is removed and steam becomes water?
Condensation
The compressor in a thermal compression distillation unit raises the temperature of the steam from 212°F to what temperature?
222°F
What type of treatment is used in residual disinfection as the final step in the water treatment process?
Chlorination
What minimum amount of residual chlorine is considered significant?
0.1 ppm
What standard period of contact time is required for disinfection purposes to kill disease-producing organisms?
30 minutes
