Passage (Questions 96-100)
Rainwater harvesting, once a common practice in Indian villages, is returning to the cities. Roof-top systems collect rain that would otherwise run into drains and store it in tanks or let it percolate underground, raising the water table. Although the initial cost is modest, many households ignore the idea, believing that the municipal supply will always remain adequate. Experts warn that this belief is dangerously optimistic: groundwater levels in several metropolitan areas have fallen by many metres in a decade. They urge that harvesting be made compulsory for new buildings, with penalties for non-compliance, rather than left to goodwill alone.
What is the main idea of the passage?
- AMunicipal water supply in cities is always adequate.
- BGroundwater levels have risen because of roof-top systems.
- CVillages should stop practising rainwater harvesting.
- DRainwater harvesting is returning to cities and experts want it made compulsory for new buildings.
Correct answer: D