A cubic foot per second (cfs) is a unit of flow rate that describes the volume of water or other fluids moving past a point every second. It is commonly used in hydrology to measure rivers and streams, providing insight into water availability and flood prediction. To put it in perspective, one cubic foot per second is equivalent to 7.48 gallons per second. Thus, a modest stream might flow at several tens of cfs, while larger rivers, such as the Mississippi, can exceed 500,000 cfs!
Interestingly, this unit has historical significance dating back to the early days of water management, where it played a crucial role in the development of infrastructure for agriculture and urban planning, influencing patterns of settlement and economic development around the world.
“Gallon per second” is a fascinating unit of flow rate often used in engineering and environmental studies to quantify the movement of liquids. It might surprise you that in the United States, the Imperial gallon conversion to seconds adds an intriguing complexity. The U.S. gallon, used primarily in this unit, is smaller than the Imperial gallon used in the UK. This difference can significantly impact calculations involving large-scale water management systems or river flows.
Historically, variations of the gallon were used to measure commodities, including beer and wine, creating a diverse heritage for this versatile unit. Imagine that a single gallon per second flow rate could fill an Olympic-sized swimming pool in just under 32 hours! Such conversions shed light on the immense scale of water flow in various applications, from plumbing to hydrology.
Cubic feet per second | Gallons per second |
---|---|
0
ft³/s
|
0
gal/s
|
1
ft³/s
|
7.48052
gal/s
|
2
ft³/s
|
14.96103
gal/s
|
3
ft³/s
|
22.44155
gal/s
|
4
ft³/s
|
29.92206
gal/s
|
5
ft³/s
|
37.40258
gal/s
|
6
ft³/s
|
44.88309
gal/s
|
7
ft³/s
|
52.36361
gal/s
|
8
ft³/s
|
59.84413
gal/s
|
9
ft³/s
|
67.32464
gal/s
|
10
ft³/s
|
74.80516
gal/s
|
11
ft³/s
|
82.28567
gal/s
|
12
ft³/s
|
89.76619
gal/s
|
13
ft³/s
|
97.2467
gal/s
|
14
ft³/s
|
104.72722
gal/s
|
15
ft³/s
|
112.20773
gal/s
|
16
ft³/s
|
119.68825
gal/s
|
17
ft³/s
|
127.16877
gal/s
|
18
ft³/s
|
134.64928
gal/s
|
19
ft³/s
|
142.1298
gal/s
|
20
ft³/s
|
149.61031
gal/s
|
21
ft³/s
|
157.09083
gal/s
|
22
ft³/s
|
164.57134
gal/s
|
23
ft³/s
|
172.05186
gal/s
|
24
ft³/s
|
179.53238
gal/s
|
25
ft³/s
|
187.01289
gal/s
|
26
ft³/s
|
194.49341
gal/s
|
27
ft³/s
|
201.97392
gal/s
|
28
ft³/s
|
209.45444
gal/s
|
29
ft³/s
|
216.93495
gal/s
|
30
ft³/s
|
224.41547
gal/s
|
31
ft³/s
|
231.89598
gal/s
|
32
ft³/s
|
239.3765
gal/s
|
33
ft³/s
|
246.85702
gal/s
|
34
ft³/s
|
254.33753
gal/s
|
35
ft³/s
|
261.81805
gal/s
|
36
ft³/s
|
269.29856
gal/s
|
37
ft³/s
|
276.77908
gal/s
|
38
ft³/s
|
284.25959
gal/s
|
39
ft³/s
|
291.74011
gal/s
|
40
ft³/s
|
299.22063
gal/s
|
41
ft³/s
|
306.70114
gal/s
|
42
ft³/s
|
314.18166
gal/s
|
43
ft³/s
|
321.66217
gal/s
|
44
ft³/s
|
329.14269
gal/s
|
45
ft³/s
|
336.6232
gal/s
|
46
ft³/s
|
344.10372
gal/s
|
47
ft³/s
|
351.58423
gal/s
|
48
ft³/s
|
359.06475
gal/s
|
49
ft³/s
|
366.54527
gal/s
|
50
ft³/s
|
374.02578
gal/s
|
51
ft³/s
|
381.5063
gal/s
|
52
ft³/s
|
388.98681
gal/s
|
53
ft³/s
|
396.46733
gal/s
|
54
ft³/s
|
403.94784
gal/s
|
55
ft³/s
|
411.42836
gal/s
|
56
ft³/s
|
418.90888
gal/s
|
57
ft³/s
|
426.38939
gal/s
|
58
ft³/s
|
433.86991
gal/s
|
59
ft³/s
|
441.35042
gal/s
|
60
ft³/s
|
448.83094
gal/s
|
61
ft³/s
|
456.31145
gal/s
|
62
ft³/s
|
463.79197
gal/s
|
63
ft³/s
|
471.27248
gal/s
|
64
ft³/s
|
478.753
gal/s
|
65
ft³/s
|
486.23352
gal/s
|
66
ft³/s
|
493.71403
gal/s
|
67
ft³/s
|
501.19455
gal/s
|
68
ft³/s
|
508.67506
gal/s
|
69
ft³/s
|
516.15558
gal/s
|
70
ft³/s
|
523.63609
gal/s
|
71
ft³/s
|
531.11661
gal/s
|
72
ft³/s
|
538.59713
gal/s
|
73
ft³/s
|
546.07764
gal/s
|
74
ft³/s
|
553.55816
gal/s
|
75
ft³/s
|
561.03867
gal/s
|
76
ft³/s
|
568.51919
gal/s
|
77
ft³/s
|
576
gal/s
|
78
ft³/s
|
583.48022
gal/s
|
79
ft³/s
|
590.96073
gal/s
|
80
ft³/s
|
598.44125
gal/s
|
81
ft³/s
|
605.92177
gal/s
|
82
ft³/s
|
613.40228
gal/s
|
83
ft³/s
|
620.8828
gal/s
|
84
ft³/s
|
628.36331
gal/s
|
85
ft³/s
|
635.84383
gal/s
|
86
ft³/s
|
643.32434
gal/s
|
87
ft³/s
|
650.80486
gal/s
|
88
ft³/s
|
658.28538
gal/s
|
89
ft³/s
|
665.76589
gal/s
|
90
ft³/s
|
673.24641
gal/s
|
91
ft³/s
|
680.72692
gal/s
|
92
ft³/s
|
688.20744
gal/s
|
93
ft³/s
|
695.68795
gal/s
|
94
ft³/s
|
703.16847
gal/s
|
95
ft³/s
|
710.64898
gal/s
|
96
ft³/s
|
718.1295
gal/s
|
97
ft³/s
|
725.61002
gal/s
|
98
ft³/s
|
733.09053
gal/s
|
99
ft³/s
|
740.57105
gal/s
|
100
ft³/s
|
748.05156
gal/s
|
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