Question

Irrigation channel are usually kept along the one of the following:-
1. Valley
2. Water shed
3. Contour line
4. Straight line

Answer 1

Correct Answer - Option 2 : Water shed

Explanation:

Watershed:

• The dividing ridge line between the catchment areas of two streams (drains) is called the watershed.
• Thus between two major streams, there is the main watershed (ridge line), which divides the drainage area of the two streams. Similarly, between a main stream and any of its tributary, there are subsidiary watersheds (ridge lines), dividing the drainage between the two streams on either side.
• The canal which is aligned along any natural watershed (ridge line) is called a watershed canal, or a ridge canal. Aligning a canal (main canal or branch canal or distributary) on the ridge ensures gravity irrigation on both sides of the canal.
• Since the drainage flows away from the ridge, no drainage can cross a canal aligned on the ridge. Thus, a canal aligned on the watershed saves the cost of construction of cross-drainage works.