Canal Alignment and Earthwork MCQ with answer and solution

Concept

Borrow pits in canal earthwork

Step-by-step solution

1. A borrow pit is an excavation made outside the canal section to obtain earth. 2. Earth is needed when the quantity of filling is more than the quantity of cutting. 3. So borrow pits are provided when earthwork in filling exceeds earthwork in excavation.

Explanation

In canal and embankment construction, the soil excavated is reused for banks. When the excavation is not enough to make the required fill, extra earth is taken from borrow pits. Spoil banks are the opposite: they are used when the excavation is more than the fill.

Shortcut

Fill > cut → Borrow pit. Cut > fill → Spoil bank.

Common mistake

Reversing borrow pit and spoil bank.