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The intensity of rain fall and the time interval of a typical storm are
Time interval (minutes) Intensity of rainfall (mm/minute) 0-10 0.7 10-20 1.1 20-30 2.2 30-40 1.5 40-50 1.2 50-60 1.3 60-70 0.9 70-80 0.4
The maximum intensity of rainfall for 20 minutes duration of the storm is
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- 1.5 mm/minute
- 1.85 mm/minute
- 2.2 mm/minute
- 3.7 mm/minute
Correct Option: B
When we take two consecutive intensities of rainfall, maximum values come as 2.2 and 1.5 mm/min at 20-30 and 30-40 minutes.
Maximum intensity for 20 min. duration
| = | ||
| total time |
| = | = 1.85 mm/min | |
| 10 + 10 |
