Question

Match List-I with List-II

List-I (Rainfall interpretation)	List-II (Represented By)
(A) Mass curve	(I) Rainfall intensity vs time
(B) Unit hydrograph	(II) Cumulative precipitation vs time
(C) Depth area duration curve	(III) Discharge rate vs Time
(D) Hyetograph	(IV) Average depth of rainfall vs area

• (A) - (III), (B) - (IV), (C) - (I), (D) - (II)
• (A) - (IV), (B) - (III), (C) - (II), (D) - (I)
• (A) - (II), (B) - (III), (C) - (IV), (D) - (I)
• (A) - (II), (B) - (IV), (C) - (III), (D) - (I)

Hint:

Use these quick definitions:
- Mass Curve \(\rightarrow\) Cumulative (always starts at 0 and goes up).
- Hyetograph \(\rightarrow\) Intensity vs Time (bar chart of rainfall).
- Hydrograph \(\rightarrow\) Discharge vs Time (flow at watershed outlet).

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
In hydrology, different graphical representations are used to interpret precipitation, runoff, and catchment response data.
Familiarity with these curves and graphs is essential for hydrograph analysis and watershed modeling.

Step 2: Detailed Explanation:
Let us match the concepts in List-I with their representations in List-II:
- (A) Mass curve: A rainfall mass curve is a plot of cumulative precipitation depth against time.
It is obtained from a recording-type rain gauge and represents the chronological accumulation of rainfall over a storm duration.
Hence, (A) matches with (II).
- (B) Unit hydrograph: A unit hydrograph is a direct runoff hydrograph resulting from 1 unit (e.g., 1 cm or 1 inch) of excess rainfall occurring uniformly over a watershed during a specified duration.
Like any hydrograph, it represents discharge rate against time.
Hence, (B) matches with (III).
- (C) Depth-Area-Duration (DAD) curve: A DAD curve is used to analyze the spatial and temporal distribution of a severe storm.
It expresses the relationship between the average depth of rainfall over a specific area for various storm durations.
Hence, (C) matches with (IV).
- (D) Hyetograph: A hyetograph is a graphical representation of rainfall intensity plotted against time.
It is usually represented as a bar chart.
Hence, (D) matches with (I).
Combining these pairs, we get the sequence: (A)-(II), (B)-(III), (C)-(IV), (D)-(I).

Step 3: Final Answer:
The correct option is (C).