Ch. 12: Static Water Supply Sources

Question 1

What is the process of raising water from a static source to supply a pumper known as?

Answer 1

drafting

Question 2

What is known as the elevation difference between the static water source and the pump intake, with the pump being higher than the water supply source?

Answer 2

lift

Question 3

Pumpers cannot be expected to draft water that is located at what depth below the level of the pump?

Answer 3

33.8 feet

Question 4

What is the maximum height to which any amount of water may be raised through a hard intake hose to the pump?

Answer 4

maximum lift

Question 5

What is the maximum lift in most circumstances?

Answer 5

no more than 25 feet

Question 6

What term is the height a column of water may be lifted in sufficient quantity to provide a reliable fire flow?

Answer 6

dependable lift

Question 7

All fire department pumping apparatus have their fire pumps rated when drafting from a lift of ___-___ feet of hard intake hose.

Answer 7

10-20

Question 8

What are the two primary types of static water supply sources that firefighters may draw from if necessary?

Answer 8

natural and man-made

Question 9

What are underground water storage receptacles that are usually found in areas that are not serviced by a hydrant system?

Answer 9

cisterns

Question 10

What are man-made impoundments that have the same characteristics of a pond or small lake?

Answer 10

ground reservoirs

Question 11

The process of raising water from a static source to supply a pumper is known as?

Answer 11

drafting

Question 12

The elevation between the static water source and the center of the pump is known as?

Answer 12

lift

Question 13

What is a process sometimes referred to as creating a vacuum (partial)?

Answer 13

The primer pumps the air out of the intake hose and the fire pump.

Question 14

In the US system of measurement, at sea level a pump can lift water -

Answer 14

33.8 feet

Question 15

The theoretical lift _____ as the altitude of drafting operations increases.

Answer 15

decreases

Question 16

Maximum lift defined as the maximum height to which any amount of water may be raised through a hard intake hose to the pump. Maximum lift varies depending on all:

Answer 16

• Atmospheric pressure
• Condition of the pump
• Condition of the primer

Question 17

What is the maximum height to which water will be lifted when the intake gauge reads 16 inches of mercury?

Answer 17

18.08.

Question 18

What is the maximum height to which water will be lifted when the intake gauge reads 300 mm of mercury?

Answer 18

4.1 meters maximum lift

Question 19

Taking into consideration the surrounding atmospheric pressure and friction loss in the intake hose, every fire pump in good repair should have a dependable lift of at least -

Answer 19

14.7 ft

Question 20

All fire department pumpers are rated at a level of __ through __ of intake hose

Answer 20

10, 20 ft

Question 21

When at draft, the pump pressure is the sum of the pump discharge pressure and the intake pressure correction. The intake pressure correction must take into account which of the following -

Answer 21

Friction loss in the intake hose and the height of the lift.

Question 22

Identify the formula to calculate pressure correction (US).

Answer 22

PC = Lift + Total Intake Hose Friction Loss / 2.3

Question 23

What is the net pump discharge pressure if a 1,000 gpm pumper operating from draft discharging water at 120 psi has a required lift of 15 feet through 20 feet of 5-inch hose ?

Answer 23

FL For First 10 ft = 4 1/2 FL For Additional 10 ft. = 1.5

129.1

PC = lift + Total Intake Hose Friction Loss / 2.3

Question 24

Which of the following is the major drawback for using a small stream as a natural static water supply?

Answer 24

Water level may drop below the usability level.

Question 25

Determine the gallons per minute of a small stream that is 20 feet wide with an average depth of 2 feet flowing approximately 10 feet per minute.

Answer 25

3,000 gpm

Q(US) = A * V * 7.5

Question 26

Which of the following is the rule of thumb for evaluating pond or small lake capacity?

Answer 26

Every 1 foot of depth for a one acre area provides 1,000 gpm for 5 hours.

Question 27

Fire departments can avoid problems of reaching the water source with a pumper by all but of the following?

Answer 27

By constructing floats for the apparatus.

Question 28

A depth of __ of water above and below a barrel-type-strainer is a good rule of thumb for minimum drafting depth

Answer 28

2 ft.

Question 29

In small streams where the water is running fast but the minimum draft depth is not adequate a __ can be used to dam the stream and raise the water level

Answer 29

Ladder and salvage cover.

Question 30

Identify from the following the operational problems presented by static water supply sources that contain excess silt and debris

Answer 30

• Clogging the strainer resulting in reduced water intake.
• Seizing-up or damage to fire pumps.
• Clogging fog stream nozzles.

Question 31

Under what conditions should a firefighter working on ice wear a personal flotation device (PFD)?

Answer 31

Regardless of the assumed water depth, all firefighters working in the close proximity to bodies of water must wear personal flotation devices.

Question 32

Cisterns vary in capacity, however, the most common sizes are -

Answer 32

10,000 to 100,000 gallons

Question 33

Which of the following statements most accurately describes ground reservoirs?

Answer 33

They typically contain many millions of gallons of water.

Question 34

A preferable method for avoiding silt and debris when attempting to draft from natural static water sources would be which of the following?

Answer 34

By the installation of a dry hydrant at the site.

Question 35

For every 1,000 feet of altitude, atmospheric pressure -

Answer 35

Decreases by 0.5 psi.

Question 36

Agricultural irrigation systems in some locations may flow in excess of -

Answer 36

1000 gpm.