About Lesson
Permissible slope of the Earth channels
- The steeper the channel, the more will be the velocity and more the discharge for the same cross-section.
- But, excessive gradient produce very high velocities which causes erosion.
- Normally, a channel slope about 0.1% is suitable.
|
Soil type |
Maximum velocity permissible , cm/sec |
|
Sand and silt |
45 |
|
Loamy, Sandy loam and silt loam |
60 |
|
Clay loam |
65 |
|
Clay |
70 |
|
Poor vegetation |
90 |
|
Fairly vegetation |
120 |
|
Good vegetation |
150 |