There are many technologies that can be adopted using roof like rainwater storage (installation and rainwater piggy banks), agricultural, fertilizing using feces and urine and food. The government must make a regulation to development this case especially give incentive that implemented this technology like reducing taxes and etc.
According to me comparing to my country, this technology is very interesting especially to solve the problem the water supply management especially at the big cities in Indonesia and give challenges that at the roof of the office building, apartment, or housing can be improved like at Seoul National University to be valuable to the future life. Their researchers show that use of rainwater is very important for eco-friendly composition, water conservation, prevent urban flooding during the rainy season and use of toilet and landscape water. Indonesia also can adopt this technology about the green roof, rainwater storage, rainwater infiltration, waterless urinal, water saving toilet and rainwater harvesting to solve many problems in Indonesia like flooding, agriculture, dry season and land use at big cities and reduce climate change. Activities at green roof facilities and class description in figure 1.
