Direction: A building site has a plot of 500 sqm
Maximum allowable height - G+ 7
Area to be utilized for paved access roads- 10%
Maximum ground coverage- 40%
Runoff coefficient for paved surface- 0.9
Maximum allowable FAR - 2.0
Runoff coefficient for unpaved surface- 0.3
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If it rains for 30 min. with an intensity of 10 cm/hr, minimum volume of rain water that can be collected will be
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- 12.75 cum
- 14 cum
- 15 cum
- 16 cum
- 12.75 cum
Correct Option: A
Rainwater in half hour = 10 × (1 / 2) = 5 cm or 0.05m
% paved area = 25% + 10% (roads) = 35% or 0.35 %
unpaved area = 100 – 35 = 65% or 0.65
Thus, Rainwater collected = Rainwater collected in paved area + Rainwater collected in unpaved area
= (0.35 × 500 × 0.05 × 0.9) + (0.65 × 500 × 0.05 ×0.3) = 12.75 cum
