Time Interval (min) Intensity (mm/min)

0-10 0.6

10-20 0.8

20-30 1.2

30-40 1.4

40-50 0.4

50-60 0.2

The maximum intensity of rainfall for 30 minutes duration of storm will be_____mm/min
1.13

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Solution

The correct option is A 1.13
Time Interval (min) Rainfall (mm)

0-30 $(0.6 \times 10) + (0.8 \times 10) + (1.2 \times 10) = 26 m m$

10-40 $(0.8 \times 10) + (1.2 \times 10) + (1.4 \times 10) = 34 m m$

20-50 $(1.2 \times 10) + (1.4 \times 10) + (0.4 \times 10) = 30 m m$

30-60 $(1.4 \times 10) + (0.4 \times 10) + (0.2 \times 10) = 20 m m$

$Maximum rainfall in 30 min = 34 m m$
$Intensity = \frac{34 m m}{30 m i n} = 1.13 m m / m i n$

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