Question

Match List I with List II:
List I
A. Water meter
B. Parshall flume
C. Current meter
D. Stilling well
E. Meter gate
List II
I. Measurement of flow in rivers and canals
II. Flow measurement in parshall flumes
III. Measurement of flow in pipes
IV. Flow measurement in open channels
V. Modified submerged orifice
Choose the correct answer from the options given below:

• A. A-IV, B-V, C-II, D-I, E-III
• B. A-I, B-II, C-III, D-IV, E-V
• C. A-II, B-IV, C-III, D-V, E-I
• D. A-III, B-IV, C-I, D-II, E-V

Hint:

To quickly solve this match:
- Water meter matches with pipes (A-III).
- Current meter matches with rivers and canals (C-I).
This helps eliminate incorrect options immediately.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Measuring water flow is essential for efficient water allocation, system design, and volumetric billing.
Flow measurement devices are classified based on whether the water flows through closed conduits (pipes) or open channels (canals, rivers, and furrows).

Step 2: Detailed Explanation:
Let us analyze and match each item:
1. Water meter (A):
This is a device installed in closed conduits to measure the volume of water passing through them.
Thus, it is used for the measurement of flow in pipes (III).
Hence, A matches with III.
2. Parshall flume (B):
This is a standard open-channel flow measurement device with a converging section, a throat, and a diverging section.
Thus, it is used for flow measurement in open channels (IV).
Hence, B matches with IV.
3. Current meter (C):
This is an instrument equipped with a rotating wheel or cup assembly used to measure the velocity of water at specific points.
It is commonly used for the measurement of flow in rivers and canals (I) via the velocity-area method.
Hence, C matches with I.
4. Stilling well (D):
This is a chamber connected to a main flow channel (like a flume or weir) to provide a calm, wave-free pool of water.
It is used to accurately measure the water head, particularly in flow measurement in parshall flumes (II).
Hence, D matches with II.
5. Meter gate (E):
This is a specialized irrigation gate designed to serve as a modified submerged orifice (V).
It controls and measures water delivery from a canal lateral into a farm ditch.
Hence, E matches with V.
Combining these matches, we get the sequence: A-III, B-IV, C-I, D-II, E-V.

Step 3: Final Answer:
The correct matching sequence is A-III, B-IV, C-I, D-II, E-V.
Hence, the correct option is (D).