In reservoirs with an uncontrolled spillway, the peak of the plotted outflow hydrograph

lies outside the plotted inflow hydrograph
lies on the recession limb of the plotted inflow hydrograph
lies on the peak of the inflow hydrograph
is higher than the peak of the plotted inflow hydrograph

Correct answer: lies on the recession limb of the plotted inflow hydrograph

Solution

In reservoirs with uncontrolled spillways, the outflow typically occurs after the inflow has peaked, meaning the peak outflow will be found on the recession limb of the inflow hydrograph as the reservoir releases water following the inflow peak.

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