<Ul> <Li> Pan India Potential: No authenticated potential of rainwater harvesting has been assessed in India . </Li> <Li> Tamil Nadu was the first state to make rainwater harvesting compulsory for every building to avoid groundwater depletion . The scheme was launched in 2001 and has been implemented in all rural areas of Tamil Nadu . Posters all over Tamil Nadu including rural areas create awareness about harvesting rainwater TN Govt site . It gave excellent results within five years, and slowly every state took it as a role model . Since its implementation, Chennai had a 50% rise in water level in five years and the water quality significantly improved . </Li> <Li> Karnataka: In Bangalore, adoption of rainwater harvesting is mandatory for every owner or the occupier of a building having the site area measuring 60 ft (18.3 m) X 40 ft (12.2 m) and above and for newly constructed building measuring 30 ft (9.1 m) X 40 ft (12.2 m) and above dimensions . In this regard, Bangalore Water Supply and Sewerage Board has initiated and constructed "Rain Water Harvesting Theme Park" in the name of Sir M. Visvesvaraya in 1.2 acres (4,900 m) of land situated at Jayanagar, Bangalore . In this park, 26 different type of rainwater harvesting models are demonstrated along with the water conservation tips . The auditorium on the first floor is set up with a "green" air conditioning system and will be used to arrange the meeting and showing of a video clip about the rainwater harvesting to students and general public . </Li> <Li> In Rajasthan, rainwater harvesting has traditionally been practised by the people of the Thar Desert . Many ancient water harvesting systems in Rajasthan have now been revived . Water harvesting systems are widely used in other areas of Rajasthan, as well, for example the chauka system from the Jaipur district . </Li> <Li> Kerala: Main article: Rainwater harvesting in Kerala </Li> <Li> Maharashtra: At present, in Pune, rainwater harvesting is compulsory for any new housing society to be registered . </Li> <Li> In Mumbai, Maharashtra, rainwater harvesting is being considered as a good solution to solve the water crisis . </Li> </Ul> <Li> Pan India Potential: No authenticated potential of rainwater harvesting has been assessed in India . </Li> <Li> Tamil Nadu was the first state to make rainwater harvesting compulsory for every building to avoid groundwater depletion . The scheme was launched in 2001 and has been implemented in all rural areas of Tamil Nadu . Posters all over Tamil Nadu including rural areas create awareness about harvesting rainwater TN Govt site . It gave excellent results within five years, and slowly every state took it as a role model . Since its implementation, Chennai had a 50% rise in water level in five years and the water quality significantly improved . </Li> <Li> Karnataka: In Bangalore, adoption of rainwater harvesting is mandatory for every owner or the occupier of a building having the site area measuring 60 ft (18.3 m) X 40 ft (12.2 m) and above and for newly constructed building measuring 30 ft (9.1 m) X 40 ft (12.2 m) and above dimensions . In this regard, Bangalore Water Supply and Sewerage Board has initiated and constructed "Rain Water Harvesting Theme Park" in the name of Sir M. Visvesvaraya in 1.2 acres (4,900 m) of land situated at Jayanagar, Bangalore . In this park, 26 different type of rainwater harvesting models are demonstrated along with the water conservation tips . The auditorium on the first floor is set up with a "green" air conditioning system and will be used to arrange the meeting and showing of a video clip about the rainwater harvesting to students and general public . </Li>

Which state in india initiated rain water harvesting