A properly designed rainwater harvesting system can supply up to 100% of household water needs. Rainwater harvesting is the practice of capturing and storing rain to provide water for human use. Simple rainwater harvesting systems can be used to supply landscape needs. It helps to reduce stormwater runoff by intercepting and sequestering it for later use.
Rainwater harvesting systems most frequently collect water from building roofs and stored in tanks. Rainwater harvesting has been a widely used technology for water supply in Vietnam’s rural areas for centuries. Nowadays, thanks to favorable rainfall conditions in the rainy season, rainwater collection and storage remain a self-help solution to meet the water needs of rural households.