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Design a vertical drop weir on Blighs theory for the following site conditions: Maximum flood discharge : 3000 cumecs HFL before construction : 305.0 m Minimum water level :d/s bed level (296 m) FSL of canal : 303 m Allowable flux : 1 m Coefficient of creep :12 Permissible exit gradient : 1/6?
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Design a vertical drop weir on Blighs theory for the following site co...
Design of Vertical Drop Weir on Bligh's Theory
Site Conditions:
- Maximum flood discharge: 3000 cumecs
- HFL before construction: 305.0 m
- Minimum water level: d/s bed level (296 m)
- FSL of canal: 303 m
- Allowable flux: 1 m
- Coefficient of creep: 12
- Permissible exit gradient: 1/6
Bligh's Theory:
Bligh's theory is used to design vertical drop weirs. According to this theory, the discharge over the weir is proportional to the square root of the head over the weir.
Design Steps:
1. Determine the height of the weir:
- H = HFL - minimum water level = 305.0 - 296.0 = 9.0 m
2. Determine the length of the crest:
- The crest length can be determined using the allowable flux and the maximum flood discharge.
- L = Q/(Cf*H^1.5) = 3000/(1*9^1.5) = 123.0 m (Assuming Cf = 1 for simplicity)
3. Determine the thickness of the weir:
- The thickness of the weir can be determined using the coefficient of creep and the height of the weir.
- T = (Ct*H)/L = (12*9)/123 = 0.87 m (Assuming Ct = 12 for simplicity)
4. Determine the slope of the weir:
- The slope of the weir can be determined using the permissible exit gradient.
- S = H/L = 9/123 = 0.073 (Assuming S = 1/6 for simplicity)
Conclusion:
Based on the above calculations, a vertical drop weir with a crest length of 123.0 m, a height of 9.0 m, a thickness of 0.87 m and a slope of 0.073 can be designed for the given site conditions.
Site Conditions:
- Maximum flood discharge: 3000 cumecs
- HFL before construction: 305.0 m
- Minimum water level: d/s bed level (296 m)
- FSL of canal: 303 m
- Allowable flux: 1 m
- Coefficient of creep: 12
- Permissible exit gradient: 1/6
Bligh's Theory:
Bligh's theory is used to design vertical drop weirs. According to this theory, the discharge over the weir is proportional to the square root of the head over the weir.
Design Steps:
1. Determine the height of the weir:
- H = HFL - minimum water level = 305.0 - 296.0 = 9.0 m
2. Determine the length of the crest:
- The crest length can be determined using the allowable flux and the maximum flood discharge.
- L = Q/(Cf*H^1.5) = 3000/(1*9^1.5) = 123.0 m (Assuming Cf = 1 for simplicity)
3. Determine the thickness of the weir:
- The thickness of the weir can be determined using the coefficient of creep and the height of the weir.
- T = (Ct*H)/L = (12*9)/123 = 0.87 m (Assuming Ct = 12 for simplicity)
4. Determine the slope of the weir:
- The slope of the weir can be determined using the permissible exit gradient.
- S = H/L = 9/123 = 0.073 (Assuming S = 1/6 for simplicity)
Conclusion:
Based on the above calculations, a vertical drop weir with a crest length of 123.0 m, a height of 9.0 m, a thickness of 0.87 m and a slope of 0.073 can be designed for the given site conditions.
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Design a vertical drop weir on Blighs theory for the following site conditions: Maximum flood discharge : 3000 cumecs HFL before construction : 305.0 m Minimum water level :d/s bed level (296 m) FSL of canal : 303 m Allowable flux : 1 m Coefficient of creep :12 Permissible exit gradient : 1/6?
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Design a vertical drop weir on Blighs theory for the following site conditions: Maximum flood discharge : 3000 cumecs HFL before construction : 305.0 m Minimum water level :d/s bed level (296 m) FSL of canal : 303 m Allowable flux : 1 m Coefficient of creep :12 Permissible exit gradient : 1/6? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about Design a vertical drop weir on Blighs theory for the following site conditions: Maximum flood discharge : 3000 cumecs HFL before construction : 305.0 m Minimum water level :d/s bed level (296 m) FSL of canal : 303 m Allowable flux : 1 m Coefficient of creep :12 Permissible exit gradient : 1/6? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Design a vertical drop weir on Blighs theory for the following site conditions: Maximum flood discharge : 3000 cumecs HFL before construction : 305.0 m Minimum water level :d/s bed level (296 m) FSL of canal : 303 m Allowable flux : 1 m Coefficient of creep :12 Permissible exit gradient : 1/6?.
Design a vertical drop weir on Blighs theory for the following site conditions: Maximum flood discharge : 3000 cumecs HFL before construction : 305.0 m Minimum water level :d/s bed level (296 m) FSL of canal : 303 m Allowable flux : 1 m Coefficient of creep :12 Permissible exit gradient : 1/6? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about Design a vertical drop weir on Blighs theory for the following site conditions: Maximum flood discharge : 3000 cumecs HFL before construction : 305.0 m Minimum water level :d/s bed level (296 m) FSL of canal : 303 m Allowable flux : 1 m Coefficient of creep :12 Permissible exit gradient : 1/6? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Design a vertical drop weir on Blighs theory for the following site conditions: Maximum flood discharge : 3000 cumecs HFL before construction : 305.0 m Minimum water level :d/s bed level (296 m) FSL of canal : 303 m Allowable flux : 1 m Coefficient of creep :12 Permissible exit gradient : 1/6?.
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