Question

The structure constructed at the head of a canal taking off from a reservoir behind a weir or dam is called as

• A. Sluice regulator
• B. Head regulator
• C. Silt excluder
• D. Silt extractor

Hint:

Remember the location and function of canal headworks components:
- Weir/Barrage: Across the main river to raise the water level.
- Head Regulator: At the entrance of the canal to control flow into it.
- Silt Excluder: In the river, just before the head regulator, to keep silt out.
- Silt Ejector: In the canal, after the head regulator, to remove silt that got in.

Answer 1

The Correct Option is B

Step 1: Understanding the Question:
Structure at starting point of canal taking off from river.

Step 2: Key Structure (Alternate):
Head regulator (canal head regulator): controls entry of water and silt into canal. Has gates to regulate discharge.

Step 3: Detailed Explanation:
Silt excluder: upstream of head regulator, excludes bed load. Silt extractor/ejector: inside canal, removes entered silt. Cross regulator: downstream in canal for water level control. Head regulator is the entry gate.

Step 4: Final Answer:
Head regulator.