Question

Match List I with List II:
List I (Drainage)
A. Vertical drainage
B. Water absorption test
C. Inverse auger hole
D. Organic envelope material
E. To drain scattered depressions/potholes
List II (Drainage Situations)
I. Hydraulic conductivity
II. Coconut fibre
III. Random System
IV. Clay pipes
V. Shallow/deep tube wells
Choose the correct answer from the options given below:

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

Hint:

To solve this matching question quickly: associate "Vertical drainage" with "tube wells" (A-V) and "Organic envelope" with "Coconut fibre" (D-II). This leaves only one matching option available.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Agricultural drainage involves removing excess surface and subsurface water to create a favorable root zone environment.
This field uses specialized testing methods, drain designs, and envelope materials, each tailored to specific soil conditions and geographic landscapes.

Step 2: Detailed Explanation:
Let us analyze the matches for each drainage item:
1. Vertical drainage (A):
This method lowers the water table by pumping groundwater from a network of wells.
It relies on shallow or deep tube wells (V) to lower the local water table, particularly in areas with highly permeable deeper aquifers.
Thus, A matches with V.
2. Water absorption test (B):
This is a standard quality control test performed on agricultural drainage tiles, particularly clay pipes (IV).
The test measures the percentage of water absorbed by the clay walls to ensure the pipes are durable and resistant to frost or structural degradation.
Thus, B matches with IV.
3. Inverse auger hole method (C):
This field test is used to measure the hydraulic conductivity (I) of soil above the water table.
Water is poured into an auger hole, and its rate of fall is measured to calculate the soil's permeability.
Thus, C matches with I.
4. Organic envelope material (D):
Envelopes are placed around subsurface drains to prevent fine soil particles from clogging the pipe.
Coconut fibre (II) is a widely used, biodegradable organic envelope material.
Thus, D matches with II.
5. To drain scattered depressions/potholes (E):
In fields with irregular, undulating topography containing scattered low-lying wet spots or potholes, a Random System (III) of drainage is used.
This system connects these scattered depressions directly using a main line, rather than applying a uniform grid pattern over the entire field.
Thus, E matches with III.
Combining these matches: A-V, B-IV, C-I, D-II, E-III.

Step 3: Final Answer:
The correct matching sequence is A-V, B-IV, C-I, D-II, E-III.
Hence, the correct option is (C).