Question

Match List I with List II 
Choose the correct answer from the options given below: 
 

• A. A - III, B - IV, C - I, D - II
• B. A - II, B - IV, C - I, D - III
• C. A - IV, B - III, C - I, D - II
• D. A - III, B - I, C - IV, D - II

Hint:

To remember the layouts:
- Herringbone \(\rightarrow\) laterals join from both sides (like a fish bone).
- Grid Iron \(\rightarrow\) laterals join from only one side.
- Cut-off \(\rightarrow\) intercepts seepage along the upper slope.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Subsurface drainage systems are designed in different geometric layouts depending on the topography, wetness patterns, and shape of the field.
Detailed Explanation:
Let us match each drainage layout with its key design characteristic:
- A. Random: This layout is used when only specific, isolated areas of a field suffer from poor drainage.
Drains are placed only in these wet depressions, avoiding the cost of installing a full-field system.
This matches with III. For draining isolated patches when entire areas does not require drainage.
- B. Herringbone: In this layout, the main or submain collector pipe is installed along the lowest part of the field.
Laterals are connected to this central pipe from both sides at an angle, resembling a fish skeleton.
This matches with I. Main line and submain laid in low area and lateral are drawn from both sides.
- C. Grid Iron: This layout is used for flat, uniformly wet fields.
Parallel laterals enter the main collector pipe from only one side, which helps reduce the total length of double-drained areas.
This matches with IV. Laterals enter the main line only from one side.
- D. Cut-off: Also known as an interceptor drain, this system is installed along the upper boundary of a wet slope.
It intercepts lateral groundwater seepage before it can reach and damage the lower parts of the field.
This matches with II. Drains placed at the upper edge of wetted area to intercept the subsurface seepage.
Combining these pairs gives the sequence: \[ \text{A - III}, \ \text{B - I}, \ \text{C - IV}, \ \text{D - II} \] This matches Option (D).

Step 2: Final Answer:
The correct matching sequence is A - III, B - I, C - IV, D - II.