This is a system of catching rainwater where it falls.
Roof top rainwater harvesting for existing buildings.
Existing rooftop rainwater harvesting system is an acceptable solution for alleviating the water shortage problem in urban areas.
Roof based rainwater harvesting refers to collecting rainwater runoff from roof surfaces which usually provides a much cleaner source of water that can be also used for drinking.
However practical performance need functional tool to make the real progress for the publics.
Herein we developed a practical evaluation tool in the research.