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Properly designed irrigation systems will have mainlines with friction lower than 1% or 1 meter of friction per 100 meters. In small systems with short mainlines friction can be higher. The following table indicates the flow rates through PVC class 6 poly pipes, with frictions of 1, 2, 3 and 4 meters per 100 meters, the approximate flow velocities are indicated in different colours. High flow velocities must be used with caution as water hammer action might damage the line if valves are opened and/or closed too quickly.
Flow Rate m3/h
Pipe Size
PVC/6
|
Friction |
1 %
|
2 %
|
3 %
|
4 %
|
| 63 |
7 |
10 |
13 |
15 |
| 75 |
11 |
17 |
20 |
24 |
| 90 |
18 |
27 |
34 |
39 |
| 110 |
32 |
46 |
58 |
68 |
| 125 |
35 |
65 |
81 |
95 |
| 140 |
60 |
90 |
111 |
130 |
| 160 |
85 |
126 |
160 |
190 |
| 200 |
160 |
230 |
290 |
340 |
| 250 |
290 |
420 |
530 |
620 |
| 315 |
550 |
800 |
1000 |
1160 |
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Flow Velocity
(m/s)
|
0 - 1.5
|
1.5 - 2.5
|
2.5 - 5
|
|
| |
OK
Good practice
|
Use with
caution |
Too high
Do not use
|
|
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Products 
