Question:

Steep rise in the flow-mass curve during a certain period indicates

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For a flow-mass curve: \[ \boxed{\text{Slope}=\text{Rate of Flow}} \] A steeper slope always indicates a larger discharge.
Updated On: Jul 23, 2026
  • Very high evaporation losses during that period
  • Flash floods during that period
  • 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 is B

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 \[ \boxed{(B)\;\text{Flash floods during that period}.} \]
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