Cross Drainage Works MCQ with answer and solution

Concept

In an aqueduct the canal is carried over the natural drain on a bridge-like structure, so the drain flows below the canal.

Step-by-step solution

1. An aqueduct is a cross drainage work in which the canal crosses over the drain. 2. The canal bed is above the drain's HFL (high flood level). 3. The drain flows freely below the canal. 4. So the natural drainage is below the canal. Answer (B).

Explanation

An aqueduct is like a bridge that carries the canal over the drain. The canal bed is above the drain's high flood level, so the drain water flows freely below it. That is why the natural drainage is below the canal.

Why the other options are wrong

(A) Drain above the canal is a super passage or canal syphon, not an aqueduct. (C) A parallel drain does not cross the canal, so no cross drainage work is needed. (D) Drain at the canal level is a level crossing.

Shortcut

Aqueduct = canal over drain. Super passage = drain over canal.

Common mistake

Confusing aqueduct (canal over drain) with super passage (drain over canal).