GATE CE 2025 Set 2 — Question 25

MSQ+1 / -0MediumWeirs on Permeable FoundationCanals & Hydraulic StructuresWater Resources EngineeringPipingSeepageGeotechnical Engineering

Geotechnical Engineering → Canals & Hydraulic Structures → Piping

Last updated 5 September 2026

Question

Pick one or more CORRECT statement(s) from the choices given below, in the context of upstream and downstream cut-offs provided below the concrete apron of weirs / barrages constructed across alluvial rivers.

Correct answer (B) Cut-offs are provided to increase the seepage length and prevent failure due to piping.; (C) The bottom level of cut-offs mainly depends on the scour depth. Solution Statement (A) is incorrect as cut-offs manage subsurface seepage, not surface flow rate. Statement (B) is correct as cut-offs increase the creep path (seepage length), reducing the exit gradient to prevent piping. Statement (C) is correct because cut-offs must extend below the maximum scour depth to ensure the structure's stability. Statement (D) is incorrect as the hydraulic jump is controlled by the stilling basin floor level and length, not the cut-offs themselves. Turn this into a strength. Explore AI-powered practice and doubt support with Success Tracker.

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Correct answer (B) Cut-offs are provided to increase the seepage length and prevent failure due to piping.; (C) The bottom level of cut-offs mainly depends on the scour depth. Solution Statement (A) is incorrect as cut-offs manage subsurface seepage, not surface flow rate. Statement (B) is correct as cut-offs increase the creep path (seepage length), reducing the exit gradient to prevent piping. Statement (C) is correct because cut-offs must extend below the maximum scour depth to ensure the structure's stability. Statement (D) is incorrect as the hydraulic jump is controlled by the stilling basin floor level and length, not the cut-offs themselves.

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