GATE CE 2019 Set 2 — Question 24
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Water Resources Engineering → Hydrographs & Groundwater → Flood Routing
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Question
An inflow hydrograph is routed through a reservoir to produce an outflow hydrograph. The peak flow of the inflow hydrograph is and the time of occurrence of the peak is . The peak flow of the outflow hydrograph is and the time of occurrence of the peak is . Which one of the following statements is correct?
Correct answer
(C) P_I P_O and t_I < t_O
Solution
In reservoir routing, the storage effect causes attenuation and lag. Attenuation means the peak of the outflow hydrograph () is less than the peak of the inflow hydrograph (), so . Lag means the peak of the outflow hydrograph occurs later than the peak of the inflow hydrograph, so or .
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