PROSPECTS OF ROOFTOP RAINWATER HARVESTING: A CASE FROM NEPAL

The overall objective of this study is to evaluate the possibility of promotion of rooftop rainwater harvesting in addressing even increasing water scarcity in Kathmandu, Lalitpur and Madhyapur Thimi municipalities. Fifty respondents were taken for questionnaire survey for each municipality. The questionnaire was distributed among friends, relatives, school teachers, publics in hospital and environment exhibitions. They were requested to fill up the questionnaire. Cases of organizations, schools and residences were studied where the rainwater harvesting systems were installed. Interview schedule was carried out with the owner of the houses/schools/organizations where the system was installed. Out of fifty respondents in Kathmandu Metropolitan City, 90% respondents are willing to know about rainwater harvesting system. 52 % respondents already knew about modern rainwater harvesting system. Out of 50 respondents in Lalitpur Metropolitan City, 100% respondents are willing to know about rainwater harvesting system. 52% respondents already know about modern rainwater harvesting system. Out of 50 respondents in Madhyapur Thimi Municipality, 100% respondents are willing to know about rainwater harvesting system. 32% respondents already know about modern rainwater harvesting system. The overall domestic reduction in demand for Kathmandu valley is found to be 24.09% and the overall institutional reduction in demand for Kathmandu valley is found to be 23.99% which indicates that rainwater harvesting system plays an immense role to reduce water demand to some extent. So, there must be massive campaign to motivate people to install rainwater harvesting systems as we are suffering from maximum water scarcity nowadays. This system can replenish the demands of millions of people of Kathmandu valley. If people start using rainwater harvesting system, then the demand of the people will be fulfilled by rainwater. People will feel relief to some extent. They will be free from paying huge bills for tankers every month because rainwater harvesting system is one time investment. So, it proves to be economical in long run as well. So we must start using rainwater harvesting system for fulfilling our great water demand