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Civil Engineering QUESTION #6580
Question 1
A mean annual runoff of \(1\,\text{m}^3/\text{s}\) from a catchment of area \(31.54\,\text{km}^2\) corresponds to an effective rainfall depth of:
  • 100 cm✔️
  • 1.0 cm
  • 100 mm
  • 3.17 cm
Correct Answer Explanation
Annual runoff volume \(= 1 \times 365.25 \times 24 \times 3600 \approx 31.54 \times 10^6\,\text{m}^3\). Effective rainfall \(= \dfrac{31.54 \times 10^6}{31.54 \times 10^6\,\text{m}^2} = 1\,\text{m} = 100\,\text{cm}\).