Q1. [1] medium thorough-understanding
Which of the following best explains why Tamil Nadu made rooftop rainwater harvesting structures compulsory for all houses?
(A) It is the state with the highest annual rainfall in India, making collection easy.
(B) Groundwater levels in Tamil Nadu have never been a concern, so rooftop harvesting supplements surface water.
(C) Mandating the structure ensures recharge of groundwater and secured household water supply as a matter of legal obligation rather than individual choice.
(D) The state government wanted to reduce dependence on the Indira Gandhi Canal.
- A It is the state with the highest annual rainfall in India, making collection easy.
- B Groundwater levels in Tamil Nadu have never been a concern, so rooftop harvesting supplements surface water.
- C Mandating the structure ensures recharge of groundwater and secured household water supply as a matter of legal obligation rather than individual choice.
- D The state government wanted to reduce dependence on the Indira Gandhi Canal.
Generated by claude-sonnet-4-6 · 2026-06-26 13:31 · grounding rag
Model Answer
(C) Mandating the structure ensures recharge of groundwater and secured household water supply as a matter of legal obligation rather than individual choice.
Source: Water Resources, Chapter 3 — Rainwater Harvesting section
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Explanation
The textbook states: "Tamil Nadu is the first state in India which has made rooftop rainwater harvesting structure compulsory to all the houses across the state. There are legal provisions to punish the defaulters." This points to legal compulsion as the key reason — making conservation obligatory rather than voluntary. Options A and B are factually incorrect; Option D confuses Tamil Nadu with Rajasthan (Indira Gandhi Canal is in Rajasthan).