Final answer:
To find the volume of water that can be harvested from the terrace, calculate the water collected from each part separately and then add them together. The total volume of water collected is 135,000 liters or 135 cubic meters.
Step-by-step explanation:
The question asks about calculating the volume of water that can be collected by rainwater harvesting from a terrace consists of two parts with different collection efficiencies, given a certain amount of annual rainfall.
To calculate the volume of water collected, we use the formula: Volume of water collected = Area of the terrace × Annual rainfall × Collection efficiency.
For the first area of 200 sq.m with a collection efficiency of 60%, the calculation would be:
200 sq.m × 600mm/year × 0.60 = 72,000 liters.
For the second area of 150 sq.m with a collection efficiency of 70%, the calculation would be:
150 sq.m × 600mm/year × 0.70 = 63,000 liters.
The total volume of water that can be collected by the entire terrace would then be the sum of both areas: 72,000 liters + 63,000 liters = 135,000 liters or 135 cubic meters.