Allied & ICAR Exam Bank • ALLIED_0466 MCQ • 1 Mark

Section 4: Soil and Water Conservation Engineering

Gully Control and Drop Spillways

Subtopic: Gully Control and Drop Spillways

Question Statement:

Grassed waterways used in soil conservation watersheds are typically designed with a parabolic cross-section because:

Options:

  • (A) Natural channels naturally assume a parabolic shape and it provides stable hydraulic conveyance at varying flow depths
  • (B) It is easiest to construct with a shovel
  • (C) Manning's $n$ is zero in a parabola
  • (D) It eliminates water evaporation entirely

Answer Key:

A

Step-by-Step Solution & Explanation

Parabolic waterways conform to natural channel geometry, prevent edge gullying, and facilitate maintenance with mowers.
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