From earthquakes to fires, Southern California is a danger zone.
Suppose every house in SoCal had a sprinkler system, plumbed with metal pipe not PVC, running to the rooftop. Water could be stored in a cistern, much like those the ancient Romans used. Where would this water come from, you ask? During heavy rainfalls, as occurred last winter, the water would be saved, not lost, not allowed to run down channels into the Pacific Ocean.
