As an AI language model, I have limited knowledge about specific duplex villas. However, here are some general types of rainwater harvesting systems that can be used:
1. Rooftop rainwater harvesting: The rainwater is collected from the roof of the villa using gutters and downspouts and then stored in underground or above-ground tanks for later use.
2. Surface runoff rainwater harvesting: This involves collecting rainwater from various surfaces like driveways, walkways, etc., and channeling it to the storage tanks.
3. Permeable pavement rainwater harvesting: This system involves the installation of permeable pavements that allow rainwater to seep through and get collected in the storage tanks.
4. Green roof rainwater harvesting: This is a type of rooftop rainwater harvesting system that involves the installation of a green roof, which absorbs rainwater and filters it before it enters the storage tank.
5. Vertical garden rainwater harvesting: This system involves growing plants on vertical walls, which absorb rainwater and filter it before it enters the storage tank.
The type of rainwater harvesting system used in a duplex villa will depend on various factors, such as the size of the roof, the amount of rainfall, the water usage needs, and the availability of space.
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