Allied & ICAR Exam Bank • ALLIED_0885 MCQ • 1 Mark

Section 4: Soil and Water Conservation Engineering

Gully Control and Drop Spillways

Subtopic: Gully Control and Drop Spillways

Question Statement:

In USBR Type III stilling basins for chute spillways with incoming Froude numbers $4.5 < Fr < 17$, baffle piers are installed on the basin floor to:

Options:

  • (A) Dissipate kinetic energy through direct impact and stabilize the hydraulic jump within a shorter length
  • (B) Prevent sediment deposition
  • (C) Accelerate water velocity
  • (D) Support a roadway bridge

Answer Key:

A

Step-by-Step Solution & Explanation

Baffle piers absorb hydraulic thrust directly through hydrodynamic drag, allowing a basin length of only $L \approx 2.7 y_2$ instead of $6 y_2$.
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