Civil Engineering (CE) Exam  >  Civil Engineering (CE) Questions  >   If the specific energy at the upstream secti... Start Learning for Free
If the specific energy at the upstream section of a rectangular channel is 3 m and minimum specific energy is 2.5 m the maximum height of hump without causing afflux will be
  • a)
    1.2 m
  • b)
    2.75 m
  • c)
    0.5 m
  • d)
    2.5 m
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
If the specific energy at the upstream section of a rectangular chann...
∆Z = height of hump = E1 − Emin
E1 = Energy at section ① (before hump)
Emin = Minimum Energy at critical flow ∆Z = 3 − 2.5 = 0.5m
View all questions of this test
Most Upvoted Answer
If the specific energy at the upstream section of a rectangular chann...
Given data:
Specific energy at upstream section = 3 m
Minimum specific energy = 2.5 m

To find: Maximum height of hump without causing afflux

Assumption: The flow is subcritical, i.e., Froude number < />

Formula used:
Afflux height = (specific energy at upstream section - minimum specific energy)/Froude number

Explanation:
1. Calculation of Froude number:
Froude number (Fr) = velocity of flow / √(acceleration due to gravity x hydraulic depth)
Here, the channel is rectangular, and the hydraulic depth (D) can be taken as the depth of flow (h).
Fr = velocity of flow / √(acceleration due to gravity x h)

2. Calculation of afflux height:
Afflux height = (specific energy at upstream section - minimum specific energy)/Froude number

3. Substituting the given values:
Fr = velocity of flow / √(acceleration due to gravity x h)
1 = velocity of flow / √(9.81 x h)
Velocity of flow = √(9.81 x h)
Fr = 1/√(h)
Afflux height = (3 - 2.5)/(1/√(h))
Afflux height = 0.5 / (1/√(h))
Afflux height = 0.5√(h)

4. Maximum height of hump without causing afflux:
To avoid afflux, the height of the hump should be less than the afflux height.
Therefore, maximum height of hump = afflux height = 0.5√(h)

5. Solving for h:
Maximum height of hump = 0.5√(h)
2 = 0.5√(h)
4 = h
h = 4^2 = 16 m^2

The maximum height of hump without causing afflux is 0.5 m.
Explore Courses for Civil Engineering (CE) exam

Top Courses for Civil Engineering (CE)

If the specific energy at the upstream section of a rectangular channel is 3 m and minimum specific energy is 2.5 m the maximum height of hump without causing afflux will bea) 1.2 mb) 2.75 mc) 0.5 md) 2.5 mCorrect answer is option 'C'. Can you explain this answer?
Question Description
If the specific energy at the upstream section of a rectangular channel is 3 m and minimum specific energy is 2.5 m the maximum height of hump without causing afflux will bea) 1.2 mb) 2.75 mc) 0.5 md) 2.5 mCorrect answer is option 'C'. 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 If the specific energy at the upstream section of a rectangular channel is 3 m and minimum specific energy is 2.5 m the maximum height of hump without causing afflux will bea) 1.2 mb) 2.75 mc) 0.5 md) 2.5 mCorrect answer is option 'C'. 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 If the specific energy at the upstream section of a rectangular channel is 3 m and minimum specific energy is 2.5 m the maximum height of hump without causing afflux will bea) 1.2 mb) 2.75 mc) 0.5 md) 2.5 mCorrect answer is option 'C'. Can you explain this answer?.
Solutions for If the specific energy at the upstream section of a rectangular channel is 3 m and minimum specific energy is 2.5 m the maximum height of hump without causing afflux will bea) 1.2 mb) 2.75 mc) 0.5 md) 2.5 mCorrect answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for Civil Engineering (CE). Download more important topics, notes, lectures and mock test series for Civil Engineering (CE) Exam by signing up for free.
Here you can find the meaning of If the specific energy at the upstream section of a rectangular channel is 3 m and minimum specific energy is 2.5 m the maximum height of hump without causing afflux will bea) 1.2 mb) 2.75 mc) 0.5 md) 2.5 mCorrect answer is option 'C'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of If the specific energy at the upstream section of a rectangular channel is 3 m and minimum specific energy is 2.5 m the maximum height of hump without causing afflux will bea) 1.2 mb) 2.75 mc) 0.5 md) 2.5 mCorrect answer is option 'C'. Can you explain this answer?, a detailed solution for If the specific energy at the upstream section of a rectangular channel is 3 m and minimum specific energy is 2.5 m the maximum height of hump without causing afflux will bea) 1.2 mb) 2.75 mc) 0.5 md) 2.5 mCorrect answer is option 'C'. Can you explain this answer? has been provided alongside types of If the specific energy at the upstream section of a rectangular channel is 3 m and minimum specific energy is 2.5 m the maximum height of hump without causing afflux will bea) 1.2 mb) 2.75 mc) 0.5 md) 2.5 mCorrect answer is option 'C'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice If the specific energy at the upstream section of a rectangular channel is 3 m and minimum specific energy is 2.5 m the maximum height of hump without causing afflux will bea) 1.2 mb) 2.75 mc) 0.5 md) 2.5 mCorrect answer is option 'C'. Can you explain this answer? tests, examples and also practice Civil Engineering (CE) tests.
Explore Courses for Civil Engineering (CE) exam

Top Courses for Civil Engineering (CE)

Explore Courses
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev