For a given open channel, if the Chezy's coefficient (C) is decreased, then how will it affect the discharge (Q) of the flow? 

This question was previously asked in
SSC JE Civil 06 Jun 2024 Shift 3 Official Paper - 1
View all SSC JE CE Papers >
  1. Q will decrease
  2. Q will remain constant 
  3. Q will become zero
  4. Q will increase 

Answer (Detailed Solution Below)

Option 1 : Q will decrease
Free
Building Materials for All AE/JE Civil Exams Mock Test
14.9 K Users
20 Questions 20 Marks 20 Mins

Detailed Solution

Download Solution PDF
- www.guacandrollcantina.com

Effect of Chezy's Coefficient on Discharge in an Open Channel:

The discharge (Q) of the flow in an open channel is directly related to the Chezy's coefficient (C) through the Chezy's formula:

Q = \(AC \sqrt{RS}\)

Where:

  • Q is the discharge.
  • A is the cross-sectional area of flow.
  • C is the Chezy's coefficient.
  • R is the hydraulic radius (ratio of the cross-sectional area to the wetted perimeter).
  • S is the slope of the energy grade line.

Chezy's Coefficient (C): It is a dimensionless parameter that depends on the roughness of the channel surface and affects the velocity of the flow. A higher C indicates a smoother channel with higher flow velocity, while a lower C indicates a rougher channel with lower flow velocity.

Impact on Discharge (Q):
If the Chezy's coefficient (C) decreases, it directly decreases the value of the discharge (Q). This is because Q is directly proportional to C. As C decreases, the overall flow velocity decreases, which in turn reduces the discharge.

Conclusion: If the Chezy's coefficient (C) is decreased, the discharge (Q) will decrease.

Latest SSC JE CE Updates

Last updated on May 28, 2025

-> SSC JE notification 2025 for Civil Engineering will be released on June 30. 

-> Candidates can fill the SSC JE CE application from June 30 to July 21.

-> The selection process of the candidates for the SSC Junior Engineer post consists of Paper I, Paper II, Document Verification, and Medical Examination.

-> Candidates who will get selected will get a salary range between Rs. 35,400/- to Rs. 1,12,400/-.

-> Candidates must refer to the SSC JE Previous Year Papers and SSC JE Civil Mock Test, SSC JE Electrical Mock Test, and SSC JE Mechanical Mock Test to understand the type of questions coming in the examination.

-> The Staff Selection Commission conducts the SSC JE exam to recruit Junior Engineers in different disciplines under various departments of the Central Government.

Get Free Access Now
Hot Links: teen patti baaz teen patti sweet teen patti real cash game real teen patti