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

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Cisterns

Add cisterns to each house to use for watering lawns and gardens.  Easy to add when the excavators are out there.  Also possible to use for toilet flushing.

 

Could also add a water filtering system with UV treatment and provide the water for more fixtures.

Gray water from showers and sinks could go into cisterns along with rainwater in less rainy areas.  The cisterns could hook up to yard irrigation.