Table A
Minimum Required Fire Flow and Flow Duration for Buildings Fire
Area
(square feet)
| ||||||
---|---|---|---|---|---|---|
x 0.0929 form2
|
Fire Flow (GPM)2
| |||||
Type IA and IB1
|
Type IIA and IIIA1
|
Type IV and V-A1
|
Type IIB and IIIB1
|
Type V-B1
|
x 3.785 for L/min.
|
Flow Duration
(hours)
|
Up to 22,700
|
Up to 12,700
|
Up to 8,200
|
Up to 5,900
|
Up to 3,600
|
1,500
|
2
|
30,200
|
17,000
|
10,900
|
7,900
|
4,800
|
1,750
|
2
|
38,700
|
21,800
|
12,900
|
9,800
|
6,200
|
2,000
|
2
|
48,300
|
24,200
|
17,400
|
12,600
|
7,700
|
2,250
|
2
|
59,000
|
33,200
|
21,300
|
15,400
|
9,400
|
2,500
|
2
|
70,900
|
39,700
|
25,500
|
18,400
|
11,300
|
2,750
|
2
|
83,700
|
47,100
|
30,100
|
21,800
|
13,400
|
3,000
|
3
|
97,700
|
54,900
|
35,200
|
25,900
|
15,600
|
3,250
|
3
|
112,700
|
63,400
|
40,600
|
29,300
|
18,000
|
3,500
|
3
|
128,700
|
72,400
|
46,400
|
33,500
|
20,600
|
3,750
|
3
|
145,900
|
82,100
|
52,500
|
37,900
|
23,300
|
4,000
|
4
|
164,200
|
92,400
|
59,100
|
42,700
|
26,300
|
4,250
|
4
|
183,400
|
103,100
|
66,000
|
47,700
|
29,300
|
4,500
|
4
|
203,700
|
114,600
|
73,300
|
53,000
|
32,600
|
4,750
|
4
|
225,200
|
126,700
|
81,100
|
58,600
|
36,000
|
5,000
|
4
|
247,700
|
139,400
|
89,200
|
65,400
|
39,600
|
5,250
|
4
|
271,200
|
152,600
|
97,700
|
70,600
|
43,400
|
5,500
|
4
|
295,900
|
166,500
|
106,500
|
77,000
|
47,400
|
5,750
|
4
|
Greater
|
Greater
|
115,800
|
83,700
|
51,500
|
6,000
|
4
|
Greater
|
Greater
|
125,500
|
90,600
|
55,700
|
6,250
|
4
|
Greater
|
Greater
|
135,500
|
97,900
|
60,200
|
6,500
|
4
|
Greater
|
Greater
|
145,800
|
106,800
|
64,800
|
6,750
|
4
|
Greater
|
Greater
|
156,700
|
113,200
|
69,600
|
7,000
|
4
|
Greater
|
Greater
|
167,900
|
121,300
|
74,600
|
7,250
|
4
|
Greater
|
Greater
|
179,400
|
129,600
|
79,800
|
7,500
|
4
|
Greater
|
Greater
|
191,400
|
138,300
|
85,100
|
7,750
|
4
|
Greater
|
Greater
|
Greater
|
Greater
|
Greater
|
8,000
|
4
|
NOTES:
| |
1
|
Types of construction are based upon the Building Code.
|
2
|
Measured at 20 psi (137.9 KPa). See the definitions of fire
flow in this article.
|
Table B
Number and Distribution of Fire Hydrants
| |||
---|---|---|---|
Fire Flow Requirement
(GPM)
|
Minimum Number of Hydrants
|
Spacing Between Hydrants1,2,3
(feet)
|
Maximum Distance From Any Point on Street or Road Frontage to
Hydrant4
|
x 3.785 for L/min.
|
x 304.8 for mm
| ||
1,750 or less
|
1
|
500
|
250
|
1,750 to 2,250
|
2
|
450
|
225
|
2,500
|
3
|
450
|
225
|
3,000
|
3
|
400
|
225
|
3,500 to 4,000
|
4
|
350
|
210
|
4,500 to 5,000
|
5
|
300
|
180
|
5,500
|
6
|
300
|
180
|
6,000
|
6
|
250
|
150
|
6,500 to 7,000
|
7
|
250
|
150
|
7,500 or more
|
8 or more5
|
200
|
120
|
NOTES:
| |
1
|
Reduce by 100 feet (30,480 mm) for dead-end streets or roads.
|
2
|
Where streets are provided with median dividers which cannot
be crossed by firefighters pulling hose lines, or arterial streets
are provided with four or more traffic lanes and have a traffic count
of more than 30,000 vehicles per day as per the Dona Ana County Unified
Development Code, hydrant spacing shall average 500 feet (152.4) on
each side of the street and shall be arranged on an alternating basis
up to a fire flow requirement of 7,000 gallons per minute (26,495
L/min.) and 400 feet (122 m) for higher fire flow requirements.
|
3
|
Where new water mains are extended along streets where hydrants
are not needed for protection of structures or similar fire problems,
fire hydrants shall be provided at spacing not to exceed 1,000-foot
(305 m) to provide for transportation hazards or as required by the
County Fire Chief.
|
4
|
Reduce by 50 feet (15,240 mm) for dead-end streets or roads.
|
5
|
One hydrant for each 1,000 gallons per minute (3,785 L/min.)
or fraction thereof.
|