निम्नलिखित में से कौन भूजल पुनर्भरण (ग्राउंडवाटर) के मुख्य स्रोत के रूप में कार्य करता है?

Which is the first State in India where rooftop rainwater harvesting structure was made compulsory for all houses across the State?

Fill in the blanks: Tamil Nadu is the first state in India which ________ rooftop rainwater harvesting structures compulsory for all houses ________ the state.