Question Bank • QB_SWCE_WS_005 MCQ • 1 Mark

Section 4: Soil and Water Conservation Engineering

Watershed Management

Subtopic: Rainwater harvesting

Question Statement:

A rooftop rainwater harvesting installation collects runoff from an impermeable building roof of plan area $150\text{ m}^2$. During a storm with rainfall depth of $40\text{ mm}$ and a runoff coefficient $C = 0.85$, the volume of harvested water is:

Options:

  • (A) $4.5\text{ m}^3$
  • (B) $5.1\text{ m}^3$
  • (C) $6.0\text{ m}^3$
  • (D) $7.2\text{ m}^3$

Answer Key:

B

Step-by-Step Solution & Explanation

Harvested rainwater volume: $V = \text{Area} \times \text{Rainfall Depth} \times C$ $V = 150\text{ m}^2 \times 0.040\text{ m} \times 0.85 = 6.0 \times 0.85 = 5.1\text{ m}^3$ Hence, Option B is correct.
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