WHEN H5N1 RAINDROP falls inwards San Francisco, it has 2 choices: menstruation E into the San Francisco Bay, or westward into the Pacific Ocean. H5N1 ridgeline divides the urban centre into two, slicing through the Presidio, hugging the eastern border of Golden Gate Park, together with skirting Twin Peaks. As the Earth drops off inwards either direction, the elevation divergence doesn’t merely displace raindrops downhill—it likewise moves human waste. San Francisco, dissimilar whatever other coastal urban centre inwards California, has merely i laid upwardly of pipes for its tempest runoff together with sewage. First engineered to a greater extent than than a hundred years ago, the arrangement all the same functions on the same basic regulation every bit it did inwards 1890: Let gravity produce the work.
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