The type of flood routing (Group I) and the equation(s) used for the purpose (Group II) are given below.

$$\begin{array}{ll} \underline{\text{Group I}} & \underline{\text{Group II}} \\ P.\: \text{ Hydrologic flood routing} & 1. \text{ Continuity equation} \\ Q.\: \text{ Hydraulic flood routing} & 2. \text{ Momentum equation} \\ & 3. \text{ Energy equation} \end{array}$$

The correct match is

- $P-1; \: Q-1, 2 \: \& \: 3$
- $P-1; \ Q-1 \: \& \: 2 \text{ only}$
- $P-1 \: \& \: 2; Q-1 \text{ only}$
- $P-1 \: \& 2; \: Q-1 \: \& \: 2$