1. STANDARD ON WATER SUPPLIES FOR SUBURBAN AND RURAL FIRE FIGHTING

2. WATER SUPPLY DETERMINING FACTORS
EXTENT OF EVOLUTIONS
SIZE OF and TYPE OF STRUCTURE
CONTENTS
METHOD OF ATTACK
EXPOSURES
RESERVES

3. NFPA 1403: 4.2 Structures and Facilities
4.2.23
The lead instructor shall determine the rate and duration of water flow necessary ..., including the water necessary for control and extinguishment of the training fire, the supply necessary for backup lines to protect personnel, and any water needed to protect exposures.

4. NFPA 1403: 4.2 Structures and Facilities
The minimum water supply and delivery for the live fire training evolutions shall meet the criteria identified in NFPA 1142, Standard on Water Supplies for Suburban and Rural Fire Fighting.

5. Definition: 4.1.5 (1) Exposure Hazard STRUCTURE WITHIN 50 FEET and
100 SQUARE FEET OR LARGER.
(2) If class 3 or 4 OH, within 50 ft of another building, it is considered an exposure hazard regardless of size.
What is an exposure really? (Anything that we don’t want to damage)

6. CLASSIFICATION OF OCCUPANCY HAZARD
Chapter 5
CLASSIFICATION OF OCCUPANCY HAZARD
WHAT OCCUPANCY TYPE IS THE MOST LIKELY TO BE USED IN LIVE FIRE TRAINING?

7. Occupancy Hazard Classification 7 5.2.5.1 Light hazard occupancy
NFPA
Occupancy Hazard Classification 7
Light hazard occupancy
Dwellings

8. Classification Of Construction
structures shall be classified by type of construction and shall be assigned a construction classification number.

9. Dwellings Classification Of Construction
6.2.1 Type V (Wood Frame) Construction Classification Number 1.5
Dwellings

10. FOR ALL EXPOSURE HAZARDS MULTIPLY TOTAL BY:
Chapter 4
Minimum Water Supply =
(TOTAL CUBIC FT) x (CONST CLASS OCCUP 1.5) x ( Exp. Factor 1.5)
(CLASS # 7)
PER
FOR ALL EXPOSURE HAZARDS MULTIPLY TOTAL BY:
1.5

11. NFPA 1142 4.2 SINGLE STRUCTURES WITHOUT EXPOSURE HAZARDS
(2000 gal. minimum)
4.3 SINGLE STRUCTURES WITH EXPOSURE HAZARDS
(3000 gal. minimum)

12. NFPA 1403 50% Reserve SINGLE STRUCTURES WITHOUT EXPOSURE HAZARDS
(3000 gal. minimum)
SINGLE STRUCTURES WITH EXPOSURE HAZARDS
(4500 gal. minimum)

13. Determining Minimum Water Supplies
4.6
The fire department shall develop the capability to deliver the amount of water determined in accordance with Sections 4.2 through 4.5 to the incident scene at the rate shown in
Table 4.6.1

14. Total Water Required: Rate Capability:
Table 4.6.1
Total Water Required: Rate Capability:
< 2,500
2, ,999
10, ,999
> 20,000
250
500
750
1,000
Table put back in the 2007 edition
Was an exception in 2002 (old 1231)

15. What if the exposure is larger than the structure being burned?
Calculate water supply based on the larger structure

16. Multiple Exposures? NCFRC Exception Add .5 for each Exposure
Example: Exposures
st Exposure
nd Exposure
Exposure Factor

17. 3 Exposures = = 2.5
(1) (2) (3)
4 Exposures = = 3.0
(1) (2) (3) (4)

18. Determining Minimum Water Supplies
Go back to NFPA 1403:
A minimum reserve of additional water in the amount of 50 percent of the fire flow demand in shall be available to handle exposure protection or unforeseen situations.

19. Practice Time! See if your calculations are the same!
(Remember – calculate gable roofs as ½ the height from the attic floor to the ridge pole)

20. 50% additional reserve per NFPA 1403: 11,573 Total Gallons Exposure
50’
50 x 24, 2 stories with gable roof,
8’ from attic floor to ridgepole
2 story w/gable roof
8’ ceilings
8’ to ridgepole
24’
50 X 24 = 1,200 square ft.
Height = * = 20’
1,200 x 20 = 24,000 cubic ft.
(Dwelling)
Exp.
OCCUP HAZ CLASS = 7
(divide by 7) GAL.
CONST CLASS = 1.5
(multiply by 1.5) GAL.
Go to Table 4.6.1
Table shows: 500 GPM
Must be capable of flowing 500 GPM
for about 15 minutes. (7715 gal / 500GPM)
50% additional reserve per
NFPA 1403: 11,573 Total Gallons
1 EXPOSURE HAZARD
(multiply by 1.5) GAL.
Exposure

21. 65’ 1 story w/gable roof 8’ ceilings 8’ to ridgepole 30’ Dwelling
Exp.
65’ x 30’ = 1,950 square ft
Height = 8’ + 4* = 12 ft.
1,950 x 12’ = 23,400 cubic ft
1 story w/gable roof
8’ ceilings
8’ to ridgepole
30’
OCCUP HAZ CLASS = 7
(divide by 7) GAL.
CONST CLASS = 1.5
(multiply by 1.5) GAL.
Exp.
Go to Table 4.6.1
750 GPM Flow for about 14 minutes (10,029 gal / 750 GPM)
Dwelling
2 EXPOSURE HAZARDS
(multiply )
10,029 Gallons
50% additional per NFPA 1403:
15,044 Total Gallons
Exposures

22. 52’ 44’ 2 story w/ mansard roof 10’ ceilings Dwelling 36,772 Gallons
52’ x 44’ = 2,288 square ft
Height = 10’ + 10’ + 10* = 30’
2,288 x 30’ = 68,640 cubic ft
Exp.
52’
44’
2 story
w/ mansard roof
10’ ceilings
OCCUP HAZ CLASS = 7
(divide by 7) GAL.
CONST CLASS = 1.5
(multiply by 1.5) 14,708 GAL.
Exp.
Exp.
Dwelling
Go to Table 4.6.1
1000 GPM Flow for about 37 minutes (36,772 gal / 1000 GPM)
3 EXPOSURE HAZARDS
( = 2.5)
36,772 Gallons
Exposures
50% additional per NFPA 1403:
55,158 Total Gallons

23. Remember! Calculate Square Footage Calculate Cubic Footage
Occupancy Hazard Class
Construction Class
Exposure factor
Required GPM
Minutes Flow Sustained
1403 Reserve