Question

Match LIST I with LIST II
\[ \begin{array}{|l|l|} \hline \textbf{LIST I} & \textbf{LIST II} \\ \hline A. \ \text{Isohyetal method} & I. \ \text{Peak runoff rate} \\ B. \ \text{Rational method} & II. \ \text{Reingauge station} \\ C. \ \text{Point rainfall} & III. \ \text{Mean areal rainfall} \\ D. \ \text{Nash model} & IV. \ \text{Flood routing} \\ \hline \end{array} \]
Choose the correct answer from the options given below:

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

Hint:

Associate keywords: - \textbf{Isohyet/Thiessen} \(\rightarrow\) Mean Areal Rainfall - \textbf{Rational/SCS} \(\rightarrow\) Peak Runoff - \textbf{Nash/Clark/Snyder} \(\rightarrow\) Unit Hydrograph / Flood Modeling - \textbf{Point Rainfall} \(\rightarrow\) Raingauge

Answer 1

The Correct Option is A

Task 1: Associate each hydrological term/method in LIST I with its corresponding purpose or definition in LIST II.
- A. Isohyetal method: This technique calculates the III. Mean areal rainfall for a watershed by constructing contours of equal rainfall depth (isohyets). It is typically the most precise method.
- B. Rational method: An empirical formula (\(Q=CIA\)) used for estimating the I. Peak runoff rate from smaller catchments.
- C. Point rainfall: Rainfall measurement taken at a single location using a II. Reingauge station.
- D. Nash model: This conceptual model represents a watershed as a series of linear reservoirs. It is employed to generate a synthetic unit hydrograph, useful for activities such as IV. Flood routing or runoff prediction from rainfall data.
Task 2: List the correct pairings.
- A \(\rightarrow\) III
- B \(\rightarrow\) I
- C \(\rightarrow\) II
- D \(\rightarrow\) IV
This set of pairings aligns with option (A).