पश्चिमी हिमालय में कृषि के लिए बनाई गई डाइवर्जन चैनलों (मार्ग बदलने वाली वाहिकाओं) को किस नाम से जाना जाता 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.