Link to computation / answer
Link to lecture 5
Link naar les 5 |
Exercise 1
- Water-depth (D) = 1,5 m at P1 and P2
- Discharge Q = 21 m3/s
- Bed width ditch (W) = 4 m
- Slope ditch (S) = 1:3
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Questions:
- Calculate the Hydraulic Radius for the cross-section
- Calculate Reynolds number
- Is the flow laminar or turbulent?
- From which velocity will the flow be laminar, assuming the cross-section stays the same.
- From which velocity will the flow be turbulent, assuming the cross-section stays the same.
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Exercise 2
- Water-depth (D) = 1,5 m at P1
- Water-depth (D) = 1,2 m at P2
- Discharge Q = 21 m3/s
- Bed width ditch (W) = 4 m
- Slope ditch (S) = 1:3
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Questions:
- Calculate the Hydraulic Radius for the cross-section at P2
- Calculate Reynolds number at P2
- Is the flow laminar or turbulent?
Exercise 3
Calculate the hydraulic radius for the following cross-sections:
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| bed width b [m] |
water depth y [m] |
slope [-] |
| 4 |
1.45 |
1:3 |
| 3 |
1.37 |
1:2 |
| 5 |
2.98 |
1:4 |
| 400 |
3.2 |
1:0 |
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Exercise 4
Calculate the hydraulic radius for the following partially filled pipes |
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| Diameter D [m] |
Water depth h [m] |
| 0.8 |
0.7 |
| 0.7 |
0.3 |
| 3.4 |
1.7 |
| 2.8 |
2.0 |
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