Baffle walls for holding hydraulic jumps are provided in which type of canal fall?

Introduction / Context:
Energy dissipation below falls is essential to prevent scour. Baffle blocks/walls are devices in stilling basins that force formation and stabilization of hydraulic jumps, enhancing dissipation at shorter lengths.

Given Data / Assumptions:

• Comparing fall types by appurtenances for energy dissipation.
• Interest: which fall incorporates baffles to hold the jump.

Concept / Approach:
Montague (baffle) fall provides a baffle platform and a baffle wall (block) downstream of the glacis so that the hydraulic jump is formed and sustained on the basin, preventing its migration. Other falls like Sarda or simple vertical drops rely more on glacis length and end sills without baffle walls.

Step-by-Step Solution:
Identify the fall explicitly designed with baffles.Montague fall includes a baffle wall to anchor the jump.Hence it best answers the question.

Verification / Alternative check:
Design drawings of Montague falls show a baffle platform, baffle wall, and an end sill, a classic baffle-type stilling arrangement.

Why Other Options Are Wrong:
Sarda type fall: Trapezoidal notch and glacis; no dedicated baffle wall for jump control.English type fall/Vertical fall: Typically rely on hydraulic jump formation with glacis and end sill; not primarily baffle-wall designs.

Common Pitfalls:

• Assuming all stilling basins contain baffle walls; many use only end sills.
• Confusing “baffle platform” with a simple floor glacis.

Final Answer:
Montague type fall (baffle fall)