Water Friction in 100 Ft.

of Smooth Bore Hose

For various flows and hose sizes, table gives velocity of water and ft. of head lost in
friction in 100 ft. of smooth bore hose.
Sizes of hose shown are actual inside diameters.
Flow in Velocity Friction Velocity Friction Velocity Friction Velocity Friction Velocity Friction Velocity Friction
U.S. Gals. in Ft. Per Head in in Ft. Per Head in in Ft. Per Head in in Ft. Per Head in in Ft. Per Head in in Ft. Per Head in
Per Min. Sec. Ft. Sec. Ft. Sec. Ft. Sec. Ft. Sec. Ft. Sec. Ft.

5/8 in. 3/4 in. 1 in. 1-1/4 in. 1-1/2 in. 2 in.
1.5 1.6 2.3 1.1 .97
2.5 2.6 6.0 1.8 2.5
5 5.2 21.4 3.6 8.9 2.0 2.2 1.3 .74 .9 .3
10 10.5 76.8 7.3 31.8 4.1 7.8 2.6 2.64 1.8 1.0 1.0 .2
15 2-1/2 in. 10.9 68.5 6.1 16.8 3.9 5.7 2.7 2.3 1.5 .5
20 1.3 .32 8.2 28.7 5.2 9.6 3.6 3.9 2.0 .9
25 1.6 .51 3 in. 10.2 43.2 6.5 14.7 4.5 6.0 2.5 1.4
30 2.0 .70 1.4 .3 12.2 61.2 7.8 20.7 5.4 8.5 3.1 2.0
35 2.3 .93 1.6 .4 14.3 80.5 9.1 27.6 6.4 11.2 3.6 2.7
40 2.6 1.2 1.8 .5 10.4 35.0 7.3 14.3 4.1 3.5
45 2.9 1.5 2.0 .6 11.7 43.0 8.2 17.7 4.6 4.3
50 3.3 1.8 2.3 .7 13.1 52.7 9.1 21.8 5.1 5.2
60 3.9 2.5 2.7 1.0 15.7 73.5 10.9 30.2 6.1 7.3
70 4.6 3.3 3.2 1.3 12.7 40.4 7.1 9.8
80 5.2 4.3 3.6 1.7 4 in. 14.5 52.0 8.2 12.6
90 5.9 5.3 4.1 2.1 2.3 .5 16.3 64.2 9.2 15.7
100 6.5 6.5 4.5 2.6 2.5 .6 18.1 77.4 10.2 18.9
125 8.2 9.8 5.7 4.0 3.2 .9 12.8 28.6
150 9.8 13.8 6.8 5.6 3.8 1.3 15.3 40.7
175 11.4 18.1 7.9 7.4 4.5 1.8 5 in. 6 in. 17.9 53.4
200 13.1 23.4 9.1 9.6 5.1 2.3 3.3 .8 2.3 .32 20.4 68.5
225 14.7 29.0 10.2 11.9 5.7 2.9 3.7 1.0 2.6 .40
250 16.3 35.0 11.3 14.8 6.4 3.5 4.1 1.2 2.8 .49
275 18.0 42.0 12.5 17.2 7.0 4.2 4.5 1.4 3.1 .58
300 19.6 49.0 13.6 20.3 7.7 4.9 4.9 1.7 3.3 .69
325 14.7 23.5 8.3 5.7 5.3 2.0 3.7 .80
350 15.9 27.0 8.9 6.6 5.7 2.3 4.0 .90
375 17.0 30.7 9.6 7.4 6.1 2.6 4.3 1.0 8 in.
400 10.2 8.4 6.5 2.9 4.5 1.1 2.6 .28
450 11.5 10.5 7.4 3.6 5.1 1.4 2.9 .35
500 12.8 12.7 8.2 4.3 5.7 1.7 3.2 .43
600 15.3 17.8 9.8 6.1 6.8 2.4 3.8 .60
700 17.9 23.7 11.4 8.1 7.9 3.3 4.5 .80
800 13.1 10.3 9.1 4.2 5.1 1.1
900 14.7 12.8 10.2 5.2 5.8 1.3
1000 16.3 15.6 11.4 6.4 6.4 1.6
1100 17.9 18.5 12.5 7.6 7.0 1.9
1200 13.6 9.2 7.7 2.3
1300 14.7 10.0 8.3 2.6
1400 15.9 11.9 8.9 3.0
1500 17.0 13.6 9.6 3.3
1600 10.2 3.7
1800 11.5 4.7
2000 12.8 5.7
2500 16.0 8.6
3000 19.1 12.2

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