Explanations:Rainwater harvesting is a technique used to collect and store rainwater for various uses, such as irrigation, drinking water, and other domestic purposes. It is an effective method to conserve water and manage water resources sustainably. In India, several states have implemented rainwater harvesting initiatives to address water scarcity and promote sustainable water management practices.
Among these states, Tamil Nadu stands out for its comprehensive and mandatory approach to rainwater harvesting. In 2003, the Tamil Nadu government passed a law making it compulsory for all buildings, both new and existing, to have rooftop rainwater harvesting structures. This law was enacted to ensure that rainwater is collected and stored for use, thereby reducing the burden on the state's water supply and promoting sustainable water management.
The implementation of this policy in Tamil Nadu has been significant in addressing water scarcity issues and promoting water conservation. The state's proactive approach has set a benchmark for other states in India and has been recognized as a model for sustainable water management practices.
Other states like Andhra Pradesh and Karnataka have also implemented rainwater harvesting initiatives, but they have not made it compulsory for all houses. West Bengal, on the other hand, has not implemented such a comprehensive policy. Therefore, Tamil Nadu is the only state that has made rooftop rainwater harvesting compulsory for all houses, making it the correct answer to this question.