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Fire - Ch. 14 (Water Supply Systems) Questions with correct Answers
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Fire - Ch. 14 (Water Supply Systems)
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Fire - Ch. 14 (Water Supply Systems)These systems furnish water under pressure through fire hydrants - answerMunicipal-
type water systems
Rural areas may depend on ______ ________ sources such as lakes, streams, or other
bodies of water - answerstatic water sources
Most municipal water systems are owned and operated by a local government agency,
such as a... - answerCity, county, or special water district
A municipal water system has 3 major components: - answerThe water source, the
treatment facility, and the distribution system
Where can municipal water systems draw water from? - answerWells, rivers, streams,
lakes, or human-made water storage facilities called reservoirs
What happens at water treatment facilities? Should the water in the system be suitable
for drinking? - answerImpurities are removed from the water. The nature of the
treatment system depends on the quality of the untreated source water. Yes, the water
must be suitable for drinking
The distribution system delivers water from the treatment facility to the end users and
fire hydrants through a complex network of underground pipes, known as ________
________ - answerwater mains
Generally, water pressure ranges from _____ psi to _____ psi at the delivery point (the
recommended minimum pressure for water coming from a fire hydrant is _____ psi) -
answer20 to 80 (20 psi)
What supplies pressure to the water in most municipal water supply systems? -
answerPumps (and backup pumps in case the first pumps fail) and gravity (combination
usually)
In a pure ________-_______ system, the water source, treatment facility, and storage
facilities are located on high ground while the end users live in lower-lying areas, such
as a community in a valley - answergravity-feed
Do gravity-feed systems need pumps? - answerNo
In a municipal water supply system is using more water than the pumps can supply,
what can happen? - answerSome system will be able to operate for several days by
, relying solely on their elevated storage reserves. other systems may be able to function
for only a few hours in such scenarios
The underground distribution system that delivers water to the end users is made up of
three different sizes of water mains: - answerPrimary feeders or trunk lines, secondary
feeders or branch lines, and the distributors (biggest to smallest)
Water mains in a well-designed distribution system will follow a _______ pattern. This
helps with what? - answergrid; provides water flow to a fire hydrant from two or more
directions and establishes multiple paths from the source to each area. Minimizes
downtime for the other portions of the system if a water main breaks or needs
maintenance work
These valves are located at the connection points where the underground mains meet
the distributor mains; they control the flow of water to individual customers or to
individual fire hydrants - answerShut-off valves
How is the location of fire hydrants determined? - answerLocal standards and nationally
recommended practices (perhaps every 500 feet in residential areas and every 300 feet
in high-value commercial and industrial areas)
The two major types of municipal fire hydrants are the... - answerDry-barrel hydrant and
the wet-barrel hydrant
Dry-barrel hydrants are also called what? - answerFrostproof hydrants
In a dry-barrel hydrant, where is the valve located? Why? - answerAt the base, several
feet below ground; to keep the hydrant from freezing (dry-barrel hydrants are used in
climates where temperatures fall below freezing)
In dry-barrel hydrants, when the valve is fully opened, the hydrant drain is fully
________. Why? - answerclosed; prevents the water from being forced out of the drain
when the hydrant is under pressure
What does a partially opened hydrant valve mean for the drain? - answerThe drain is
also partially open (and pressurized water can flow out and this leakage can erode the
soil around the base of the hydrant and may damage the hydrant itself)
These types of hydrants are used in locations where temperatures do not drop below
freezing. These hydrants always have water in the barrel and do not have to be drained
after each use - answerWet-barrel hydrant
In this type of hydrant, a FF could hook up one hose line and begin flowing water and
later attach a second line and open the valve for that outlet, without having to shut down
the fire hydrant - answerWet-barrel hydrant
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