The “Litre per second” (L/s) is a crucial unit in fluid dynamics, representing the flow rate of liquids. It is widely used in engineering, hydrology, and environmental science to measure water consumption, irrigation, and sewage treatment. For instance, high-performance showerheads can have flow rates approaching 0.1 to 0.2 L/s, translating to a refreshing and efficient bath.
In larger applications, such as hydroelectric plants, turbines can handle thousands of litres per second to generate energy, showcasing how scale affects its utility. The versatility of the L/s unit enables precise calculations and planning, crucial for managing water resources in a world where sustainability is paramount. Understanding flow rates can optimize resource use, conserving water and energy in both household and industrial environments.
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.
| Litres per second | Cubic feet per second |
|---|---|
0
l/s
|
0
ft³/s
|
1
l/s
|
0.0353147
ft³/s
|
2
l/s
|
0.0706294
ft³/s
|
3
l/s
|
0.105944
ft³/s
|
4
l/s
|
0.141259
ft³/s
|
5
l/s
|
0.176573
ft³/s
|
6
l/s
|
0.211888
ft³/s
|
7
l/s
|
0.247203
ft³/s
|
8
l/s
|
0.282517
ft³/s
|
9
l/s
|
0.317832
ft³/s
|
10
l/s
|
0.353147
ft³/s
|
11
l/s
|
0.388462
ft³/s
|
12
l/s
|
0.423776
ft³/s
|
13
l/s
|
0.459091
ft³/s
|
14
l/s
|
0.494406
ft³/s
|
15
l/s
|
0.52972
ft³/s
|
16
l/s
|
0.565035
ft³/s
|
17
l/s
|
0.60035
ft³/s
|
18
l/s
|
0.635664
ft³/s
|
19
l/s
|
0.670979
ft³/s
|
20
l/s
|
0.706294
ft³/s
|
21
l/s
|
0.741608
ft³/s
|
22
l/s
|
0.776923
ft³/s
|
23
l/s
|
0.812238
ft³/s
|
24
l/s
|
0.847552
ft³/s
|
25
l/s
|
0.882867
ft³/s
|
26
l/s
|
0.918182
ft³/s
|
27
l/s
|
0.953496
ft³/s
|
28
l/s
|
0.988811
ft³/s
|
29
l/s
|
1.02413
ft³/s
|
30
l/s
|
1.05944
ft³/s
|
31
l/s
|
1.09476
ft³/s
|
32
l/s
|
1.13007
ft³/s
|
33
l/s
|
1.16538
ft³/s
|
34
l/s
|
1.2007
ft³/s
|
35
l/s
|
1.23601
ft³/s
|
36
l/s
|
1.27133
ft³/s
|
37
l/s
|
1.30664
ft³/s
|
38
l/s
|
1.34196
ft³/s
|
39
l/s
|
1.37727
ft³/s
|
40
l/s
|
1.41259
ft³/s
|
41
l/s
|
1.4479
ft³/s
|
42
l/s
|
1.48322
ft³/s
|
43
l/s
|
1.51853
ft³/s
|
44
l/s
|
1.55385
ft³/s
|
45
l/s
|
1.58916
ft³/s
|
46
l/s
|
1.62448
ft³/s
|
47
l/s
|
1.65979
ft³/s
|
48
l/s
|
1.6951
ft³/s
|
49
l/s
|
1.73042
ft³/s
|
50
l/s
|
1.76573
ft³/s
|
51
l/s
|
1.80105
ft³/s
|
52
l/s
|
1.83636
ft³/s
|
53
l/s
|
1.87168
ft³/s
|
54
l/s
|
1.90699
ft³/s
|
55
l/s
|
1.94231
ft³/s
|
56
l/s
|
1.97762
ft³/s
|
57
l/s
|
2.01294
ft³/s
|
58
l/s
|
2.04825
ft³/s
|
59
l/s
|
2.08357
ft³/s
|
60
l/s
|
2.11888
ft³/s
|
61
l/s
|
2.1542
ft³/s
|
62
l/s
|
2.18951
ft³/s
|
63
l/s
|
2.22483
ft³/s
|
64
l/s
|
2.26014
ft³/s
|
65
l/s
|
2.29545
ft³/s
|
66
l/s
|
2.33077
ft³/s
|
67
l/s
|
2.36608
ft³/s
|
68
l/s
|
2.4014
ft³/s
|
69
l/s
|
2.43671
ft³/s
|
70
l/s
|
2.47203
ft³/s
|
71
l/s
|
2.50734
ft³/s
|
72
l/s
|
2.54266
ft³/s
|
73
l/s
|
2.57797
ft³/s
|
74
l/s
|
2.61329
ft³/s
|
75
l/s
|
2.6486
ft³/s
|
76
l/s
|
2.68392
ft³/s
|
77
l/s
|
2.71923
ft³/s
|
78
l/s
|
2.75455
ft³/s
|
79
l/s
|
2.78986
ft³/s
|
80
l/s
|
2.82517
ft³/s
|
81
l/s
|
2.86049
ft³/s
|
82
l/s
|
2.8958
ft³/s
|
83
l/s
|
2.93112
ft³/s
|
84
l/s
|
2.96643
ft³/s
|
85
l/s
|
3.00175
ft³/s
|
86
l/s
|
3.03706
ft³/s
|
87
l/s
|
3.07238
ft³/s
|
88
l/s
|
3.10769
ft³/s
|
89
l/s
|
3.14301
ft³/s
|
90
l/s
|
3.17832
ft³/s
|
91
l/s
|
3.21364
ft³/s
|
92
l/s
|
3.24895
ft³/s
|
93
l/s
|
3.28427
ft³/s
|
94
l/s
|
3.31958
ft³/s
|
95
l/s
|
3.3549
ft³/s
|
96
l/s
|
3.39021
ft³/s
|
97
l/s
|
3.42552
ft³/s
|
98
l/s
|
3.46084
ft³/s
|
99
l/s
|
3.49615
ft³/s
|
100
l/s
|
3.53147
ft³/s
|
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