A rooftop of 5 sq m receives an average rainfall of 40 mm per day. If 80% of this rainwater can be collected in a bucket, how many liters of water are collected in one day?
Answer
160 L
The correct answer is 160 L — Give the final answer.
Step-by-step solution
- Convert rainfall depth from millimetres to metres: 40 mm = 0.04 m.
- Calculate the total volume of rainwater falling on the roof: area × depth = 5 × 0.04 = 0.2 m³.
- Apply the 80% collection efficiency: 0.2 × 0.8 = 0.16 m³.
- Convert cubic metres to litres: 0.16 × 1000 = 160 L.
- Give the final answer.
Common mistake: Neglecting collection efficiency
Concept tested: Rainwater harvesting calculation
Published · How this solution was prepared and checked
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