Direction: A rectangular channel 6.0 m wide carries a discharge of 16.0 m3 /s under uniform condition with normal depth of 1.60 m. Manning’s ‘n’ is 0.015.
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The longitudinal slope of the channel is
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- 0.000585
- 0.000485
- 0.000385
- 0.000285
Correct Option: A
B = 6 m, Q = 16 m³/s
y = 1.6 m, η = 0.015
| Q = | R2/3S1/2.A | |
| n |
| R = | = | = | = 1.04 m | |||
| P | B + 2y | 6 + 1.6 × 2 |
| ∴ 16 = | × (1.04)2/3S1/2 × 6 | |
| 0.015 |
∴ S = 0.000585.
