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The effective length (Le) of ogee spillway crest represented by equation, where L = the net clear length of the spillway crest, kp, = Pier contraction coefficient, ka = Abutment contraction coefficient, N = Number of piers, He = total design head on the crest including velocity head
  • a)
    Le = L - 2[kp · N + ka] He
  • b)
    Le = L - [kp · N + ka] He
  • c)
    Le = L - [kp + ka N] He
  • d)
    None of these
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
The effective length (Le) of ogee spillway crest represented by equati...
Explanation:

Effective Length of Ogee Spillway Crest Equation:
- The effective length (Le) of the ogee spillway crest is calculated using the equation: Le = L - 2[kp·N + ka] He
- Where:
- L = the net clear length of the spillway crest
- kp = Pier contraction coefficient
- ka = Abutment contraction coefficient
- N = Number of piers
- He = total design head on the crest including velocity head

Calculation Steps:
1. Subtract twice the sum of the pier contraction coefficient and abutment contraction coefficient multiplied by the number of piers from the net clear length of the spillway crest.
2. Multiply the total design head on the crest by the result obtained in step 1 and subtract it from the net clear length to get the effective length of the ogee spillway crest.
Therefore, the correct formula for calculating the effective length of the ogee spillway crest is option 'A': Le = L - 2[kp·N + ka] He.
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The effective length (Le) of ogee spillway crest represented by equati...
Concepts:
Ogee Spillway:
1. The effective length (Le) of the ogee spillway crest is given as:

Le = L - 2[kp · N + ka] He
Where
L = the net clear length of the spillway crest,​
N = Number of piers
2. The discharge passing through an ogee spillway is given as:
Q = C × √2g × Le × H3/2 
C = Discharge coefficient
H = total design head
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The effective length (Le) of ogee spillway crest represented by equation, where L = the net clear length of the spillway crest, kp, = Pier contraction coefficient, ka= Abutment contraction coefficient, N = Number of piers, He= total design head on the crest including velocity heada)Le = L - 2[kp· N + ka] Heb)Le = L - [kp· N + ka] Hec)Le = L - [kp+ kaN] Hed)None of theseCorrect answer is option 'A'. Can you explain this answer?
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The effective length (Le) of ogee spillway crest represented by equation, where L = the net clear length of the spillway crest, kp, = Pier contraction coefficient, ka= Abutment contraction coefficient, N = Number of piers, He= total design head on the crest including velocity heada)Le = L - 2[kp· N + ka] Heb)Le = L - [kp· N + ka] Hec)Le = L - [kp+ kaN] Hed)None of theseCorrect answer is option 'A'. Can you explain this answer? 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 The effective length (Le) of ogee spillway crest represented by equation, where L = the net clear length of the spillway crest, kp, = Pier contraction coefficient, ka= Abutment contraction coefficient, N = Number of piers, He= total design head on the crest including velocity heada)Le = L - 2[kp· N + ka] Heb)Le = L - [kp· N + ka] Hec)Le = L - [kp+ kaN] Hed)None of theseCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The effective length (Le) of ogee spillway crest represented by equation, where L = the net clear length of the spillway crest, kp, = Pier contraction coefficient, ka= Abutment contraction coefficient, N = Number of piers, He= total design head on the crest including velocity heada)Le = L - 2[kp· N + ka] Heb)Le = L - [kp· N + ka] Hec)Le = L - [kp+ kaN] Hed)None of theseCorrect answer is option 'A'. Can you explain this answer?.
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