Sudden spurt in irrigation demand during that period
Sudden rise in demand for water to meet hydropower generation
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The Correct Option isB
Solution and Explanation
Concept:
A flow-mass curve is a graph showing the cumulative flow (runoff) with time.
The slope of the mass curve represents the rate of flow.
• Steep slope $\rightarrow$ High flow rate.
• Gentle slope $\rightarrow$ Low flow rate.
• Horizontal line $\rightarrow$ No flow.
Step 1: Interpret the steep rise.
A steep rise in the flow-mass curve indicates a sudden increase in discharge over a short duration.
Such rapid increases generally occur during heavy rainfall events.
Step 2: Identify the hydrologic event.
Rapid runoff due to intense rainfall produces flash floods.
Hence,
\[
\boxed{\text{A steep rise in the flow-mass curve indicates flash floods}.}
\]
Therefore, the correct option is
\[
\boxed{(B)\;\text{Flash floods during that period}.}
\]