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An inflow hydrograph is routed through a reservoir to produce an outflow hydrograph. The peak flow of the inflow hydrograph is $P_i$ and the time of occurrence of the peak is $t_i$. The peak flow of the outflow hydrograph is $P_o$ and the time of occurrence of the peak is $t_o$. Which one of the following statements is correct?

1. $P_i < P_o$ and $t_i < t_o$
2. $P_i < P_o$ and $t_i > t_o$
3. $P_i > P_o$ and $t_i < t_o$
4. $P_i > P_o$ and $t_i > t_o$

Correct answer: $P_i > P_o$ and $t_i < t_o$

Solution

Reservoir routing causes attenuation and lag in the hydrograph. Hence the outflow peak is smaller than the inflow peak, and the time of peak occurrence is delayed.

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