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.
The “Litre per year” unit, though not commonly spotlighted, offers fascinating insights when it comes to monitoring fluid consumption or production over time. Imagine a single litre of water—that’s about the volume of a milk carton—gradually consumed across the span of a year. This seemingly minimal consumption can offer insightful metrics on low-rate fluid demands, such as water savings within efficient homes or the slow, steady trickle of groundwater recharges.
This unit plays a crucial role in environmental science and resource management. In ecosystems, tracking water flow in “litres per year” can help scientists understand better the natural water cycles and the sustainability of aquifers. By appreciating the subtlety of this unit, one can grasp the intricate balance of our planet’s fluid dynamics, often invisible to the untrained eye.
| Cubic feet per second | Litres per year |
|---|---|
0
ft³/s
|
0
l/a
|
1
ft³/s
|
8.93611e+8
l/a
|
2
ft³/s
|
1.78722e+9
l/a
|
3
ft³/s
|
2.68083e+9
l/a
|
4
ft³/s
|
3.57445e+9
l/a
|
5
ft³/s
|
4.46806e+9
l/a
|
6
ft³/s
|
5.36167e+9
l/a
|
7
ft³/s
|
6.25528e+9
l/a
|
8
ft³/s
|
7.14889e+9
l/a
|
9
ft³/s
|
8.0425e+9
l/a
|
10
ft³/s
|
8.93611e+9
l/a
|
11
ft³/s
|
9.82972e+9
l/a
|
12
ft³/s
|
1.07233e+10
l/a
|
13
ft³/s
|
1.16169e+10
l/a
|
14
ft³/s
|
1.25106e+10
l/a
|
15
ft³/s
|
1.34042e+10
l/a
|
16
ft³/s
|
1.42978e+10
l/a
|
17
ft³/s
|
1.51914e+10
l/a
|
18
ft³/s
|
1.6085e+10
l/a
|
19
ft³/s
|
1.69786e+10
l/a
|
20
ft³/s
|
1.78722e+10
l/a
|
21
ft³/s
|
1.87658e+10
l/a
|
22
ft³/s
|
1.96594e+10
l/a
|
23
ft³/s
|
2.05531e+10
l/a
|
24
ft³/s
|
2.14467e+10
l/a
|
25
ft³/s
|
2.23403e+10
l/a
|
26
ft³/s
|
2.32339e+10
l/a
|
27
ft³/s
|
2.41275e+10
l/a
|
28
ft³/s
|
2.50211e+10
l/a
|
29
ft³/s
|
2.59147e+10
l/a
|
30
ft³/s
|
2.68083e+10
l/a
|
31
ft³/s
|
2.77019e+10
l/a
|
32
ft³/s
|
2.85956e+10
l/a
|
33
ft³/s
|
2.94892e+10
l/a
|
34
ft³/s
|
3.03828e+10
l/a
|
35
ft³/s
|
3.12764e+10
l/a
|
36
ft³/s
|
3.217e+10
l/a
|
37
ft³/s
|
3.30636e+10
l/a
|
38
ft³/s
|
3.39572e+10
l/a
|
39
ft³/s
|
3.48508e+10
l/a
|
40
ft³/s
|
3.57445e+10
l/a
|
41
ft³/s
|
3.66381e+10
l/a
|
42
ft³/s
|
3.75317e+10
l/a
|
43
ft³/s
|
3.84253e+10
l/a
|
44
ft³/s
|
3.93189e+10
l/a
|
45
ft³/s
|
4.02125e+10
l/a
|
46
ft³/s
|
4.11061e+10
l/a
|
47
ft³/s
|
4.19997e+10
l/a
|
48
ft³/s
|
4.28933e+10
l/a
|
49
ft³/s
|
4.3787e+10
l/a
|
50
ft³/s
|
4.46806e+10
l/a
|
51
ft³/s
|
4.55742e+10
l/a
|
52
ft³/s
|
4.64678e+10
l/a
|
53
ft³/s
|
4.73614e+10
l/a
|
54
ft³/s
|
4.8255e+10
l/a
|
55
ft³/s
|
4.91486e+10
l/a
|
56
ft³/s
|
5.00422e+10
l/a
|
57
ft³/s
|
5.09358e+10
l/a
|
58
ft³/s
|
5.18295e+10
l/a
|
59
ft³/s
|
5.27231e+10
l/a
|
60
ft³/s
|
5.36167e+10
l/a
|
61
ft³/s
|
5.45103e+10
l/a
|
62
ft³/s
|
5.54039e+10
l/a
|
63
ft³/s
|
5.62975e+10
l/a
|
64
ft³/s
|
5.71911e+10
l/a
|
65
ft³/s
|
5.80847e+10
l/a
|
66
ft³/s
|
5.89783e+10
l/a
|
67
ft³/s
|
5.9872e+10
l/a
|
68
ft³/s
|
6.07656e+10
l/a
|
69
ft³/s
|
6.16592e+10
l/a
|
70
ft³/s
|
6.25528e+10
l/a
|
71
ft³/s
|
6.34464e+10
l/a
|
72
ft³/s
|
6.434e+10
l/a
|
73
ft³/s
|
6.52336e+10
l/a
|
74
ft³/s
|
6.61272e+10
l/a
|
75
ft³/s
|
6.70208e+10
l/a
|
76
ft³/s
|
6.79145e+10
l/a
|
77
ft³/s
|
6.88081e+10
l/a
|
78
ft³/s
|
6.97017e+10
l/a
|
79
ft³/s
|
7.05953e+10
l/a
|
80
ft³/s
|
7.14889e+10
l/a
|
81
ft³/s
|
7.23825e+10
l/a
|
82
ft³/s
|
7.32761e+10
l/a
|
83
ft³/s
|
7.41697e+10
l/a
|
84
ft³/s
|
7.50633e+10
l/a
|
85
ft³/s
|
7.5957e+10
l/a
|
86
ft³/s
|
7.68506e+10
l/a
|
87
ft³/s
|
7.77442e+10
l/a
|
88
ft³/s
|
7.86378e+10
l/a
|
89
ft³/s
|
7.95314e+10
l/a
|
90
ft³/s
|
8.0425e+10
l/a
|
91
ft³/s
|
8.13186e+10
l/a
|
92
ft³/s
|
8.22122e+10
l/a
|
93
ft³/s
|
8.31058e+10
l/a
|
94
ft³/s
|
8.39995e+10
l/a
|
95
ft³/s
|
8.48931e+10
l/a
|
96
ft³/s
|
8.57867e+10
l/a
|
97
ft³/s
|
8.66803e+10
l/a
|
98
ft³/s
|
8.75739e+10
l/a
|
99
ft³/s
|
8.84675e+10
l/a
|
100
ft³/s
|
8.93611e+10
l/a
|
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