Solution
Option 1 -> The passage states rainwater harvesting helps "prevent flooding and soil erosion by capturing rainwater before it runs off," meaning it reduces runoff, not increases it.
Option 2 -> The passage explicitly mentions that rainwater harvesting addresses "over extraction of groundwater," "reduces dependence on municipal water supplies," and helps in "recharging groundwater."
Option 3 -> While education and awareness are mentioned as needs for implementation, sensitizing people about water wastage is not stated as a direct benefit or purpose of rainwater harvesting.
Option 4 -> There is no mention of rainwater harvesting delaying urban development; instead, the passage suggests integrating it "into modern urban planning."
Hence, Option 2: reducing the need for groundwater extraction -> Rainwater harvesting directly addresses over-extraction of groundwater by providing an alternative water source for domestic purposes and recharging groundwater aquifers, thereby reducing dependence on groundwater extraction and municipal water supplies -> correct