1
Q
Formula for Rectangle/Square
A
L x W x D x 7.5
2
Q
Formula for Rectangle (Shallow/Deep end)
A
L x W x (Average Depth) x 7.5
3
Q
Weight of water on Flat Roof (LBS)
A
L x W x D x 62.5
4
Q
Volume of Cylinder/Pipe
A
3.14 x R ^2 x H x 7.5
5
Q
GPM Per Tip Size (Theoretical)
1/2”
7/8”
15/16”
1”
1 1/8”
1 1/4”
A
53
161
185
210
266
328
6
Q
GPM per Tip Size (Fire Ground) @50 PSI
1/7”
7/8”
15/16”
1”
1 1/8”
1 1/4”
A
50
150
185
200
250
325
7
Q
GPM per tip size (Theoretical) @ 80psi
1 1/4”
1 3/8”
1 1/2”
1 3/4”
2”
A
415
502
598
814
1062
8
Q
GPM per tip size (Fire Ground) @ 80 psi
1 1/4”
1 3/8”
1 1/2”
1 3/4”
2”
A
400
500
600
800
1000
9
Q
Determining Flow for Smooth Bore Nozzle
A
GPM = 29.7 X D² X √NP
10
Q
Friction Loss Coefficients
1”
1 3/4”
2”
2 1/2”
3
3 1/2”
4”
5”
A
150
10 FFX (15.5 IFSTA)
8
0.8
0.34
0.2
0.08
Hydraulics Manual
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