Question

Weir / barrage classified according to use is known as

• A. Storage dam
• B. Diversion dam
• C. Detention dam
• D. Check dam

Hint:

Remember the primary function of different river structures:
- Dam (large) $\rightarrow$ Storage (creates a reservoir).
- Weir / Barrage $\rightarrow$ Diversion (raises water level to feed a canal).
- Detention Dam $\rightarrow$ Flood Control (temporary storage).

Answer 1

The Correct Option is B

Step 1: Understanding the Question:
Functional classification of weir or barrage.

Step 2: Key Classification (Alternate):
Diversion structure: raises water level to divert flow into canal. Storage dam: creates reservoir. Detention dam: flood control. Check dam: small, erosion control.

Step 3: Detailed Explanation:
Weir/barrage is a low-head structure across river, primarily for irrigation diversion. Barrage has gates, weir may be ungated. Not for long-term storage. Head regulator at canal off-take controls entry.

Step 4: Final Answer:
Diversion dam/structure.