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A trapezoidal channel is 10.0 m wide at the base and has a side slope of 4 horizontal to 3 vertical. The bed slope is 0.002. The channel is lined with smooth concrete (Manning’s n = 0.012). The hydraulic radius (in m) for a depth of flow of 3.0 m is
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- 20.0
- 3.5
- 3.0
- 2.1
- 20.0
Correct Option: D
| T = 10 + 2 × | × 3 = 18 m | |
| 3 |
| A = | × (10 + 18) × 3 = 42 m² | |
| 2 |
P = 10 + 2 × 5 = 20 m
| R = | = | = 2.1 m | ||
| P | 20 |
