GATE Civil Engineering (CE) 2018 Shift 2 Solved Paper

Question : 9 of 65

Marks: +1, -0

The annual average rainfall in a tropical city is

1000 {mm}

. On a particular rainy day ( 24 -hour period), the cumulative rainfall experienced by the city is shown in the graph. Over the 24 -hour period,

50 \%

of the rainfall falling on a rooftop, which had an obstruction-free area of

50 {m}^{2}

, was harvested into a tank. What is the total volume of water collected in the tank in liters?

Solution:

Cumulative rainfall

=300 {mm}

=300 × \;{50}/{100}=150 {mm}

50 \%

of rainfall
Area

=50 {m}^{2}

\Rightarrow

Volume stored in tank

=150 × 10^{-3} × 50 {m}^{3}

\;\; =7500 {L}

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