Question

Using current meter for measuring flow velocity in a stream having depth of \(1 \, \text{m}\), the observation readings should be taken at:
• at \(0\) depth of flow
• at \(0\) and \(0.2\) depth of flow
• at \(0.2\) and \(0.6\) depth of flow
• at \(0.2\) and \(0.8\) depth of flow

• A. at \(0\) depth of flow
• B. at \(0\) and \(0.2\) depth of flow
• C. at \(0.2\) and \(0.6\) depth of flow
• D. at \(0.2\) and \(0.8\) depth of flow

Hint:

Important current meter observation methods:
• One-point method: \[ \text{Velocity measured at }0.6d \]
• Two-point method: \[ \text{Velocity measured at }0.2d \text{ and }0.8d \] Memory Trick: \[ \boxed{\text{“2 and 8 give average velocity estimate”}} \]

Answer 1

The Correct Option is D