In the context of urban rainwater harvesting, estimates suggest that a single two-hour spell of rain on a standard roof surface can conserve…

Correct Option

The correct option is

8,000 litres

Explanation

Rainwater harvesting is a technique used to capture and store rainwater, serving as a critical tool for water conservation and soil conservation. By collecting runoff from surfaces like rooftops, this method reduces the speed and volume of surface flow, thereby minimizing soil erosion and aiding in groundwater recharge.

Factual Analysis

To demonstrate the efficiency of urban rainwater harvesting.

• Estimate Details: It is estimated that a single spell of rain lasting for two hours is sufficient to save approximately 8,000 litres of water from a standard roof surface.
• Significance: This data point emphasizes the immense potential of capturing precipitation in urban environments to supplement water supply and manage urban runoff effectively.

Key Takeaway

Rooftop rainwater harvesting is a highly effective conservation method, capable of recovering substantial volumes of water (e.g., 8,000 litres in a two-hour spell) to support water security and prevent erosion caused by excess surface runoff.