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A trapezoidal channel with bottom width of 3m and side slope of 1V I.5H carries a discharge of 8.0m³ /sec with the flow depth of 1.5m. The Froude number of the flow is
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- 0.066
- 0.132
- 0.265
- 0.528
Correct Option: C
| Fr = | |
| √gD |
A = [B + My]y
= (3 + 1.5 × 1.5) 1.5
= 7.87 m²
T = B + 2 my
= 3 + (2 × 1.5 × 1.5)
= 7.5 m
| D = | = | = 1.05 m | ||
| T | 7.5 |
| V = | = | = 1.016 m/s | ||
| A | 7.87 |
| Fr = | |
| √gD |
| = | = 0.316 (none is correct) | |
| √9.8 × 1.05 |
If we take D ≈ y ,
| Fr = | = 0.0265 | |
| √9.81 × 1.5 |
