Specific Energy in Open Channel Flow MCQ with answer and solution

Concept

Specific Energy in Open Channel Flow

Formula

E = y + V² / (2g)

Step-by-step solution

1. Identify the flow depth (y) and flow velocity (V). 2. Calculate the velocity head: V² / (2g). 3. Add the depth of flow to the velocity head: E = y + (V² / 2g).

Explanation

The specific energy curve plots the relationship between the depth of flow and the specific energy (energy measured relative to the channel bed) for a given discharge. This curve helps analyze how energy and water depth change across different sections in an open channel flow, allowing engineers to identify critical depth, subcritical flow, and supercritical flow regimes.

Shortcut

Associate "Specific Energy" directly with "Open Channel Flow" — specific energy measures energy relative to the channel bed at different sections of an open channel.

Common mistake

Students often confuse specific energy in open channel flow with energy loss or head loss in pipe flow, mistakenly selecting Option A.