How can you build efficient Urban communities, homes, and businesses?

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Rainwater harveting (oroginally posted in "Residential"

Rainwater is overwhelmingly wasted.  Each home should collect rainwater to be used for:  fire sprinkler reservoir, dry season law/garden care, and possibly treated for drinking water, bathing, dishwashing, laundry, etc.  Tap water has always been suspect (my personal phobia?).  The expense of individual water plant operation may add cost to homes, but the current communal system is very expensive and prone to problems.  This is an entire new industry (manufacture, install, maintain).

Maybe a device like this could be scaled up to serve several homes at once:

or this one:


Yes, it would require  larger systems than the ones described in your post.   But I am now curious about the UV light application.