Name Two Techniques of Rooftop Rainwater Harvesting. Two techniques of rooftop rainwater harvesting are: Construction of tanks so as to store the rainwaterCollection of excess rainwater in the dugwell Related posts: Why Are Different Water Harvesting Systems Considered a Viable Alternative Both Socio-Economically and Environmentally in a Country Like India? Highlight Any Three Hydraulic Structures as Part of Water Management Programmes Initiated in Ancient India Along With the Period When They Were Built. What Was the Main Purpose of Launching Multi-Purpose Projects in India After Independence? Name the River on Which Nagarjuna Sagar Dam Is Constructed.