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So this is why I couldn't siphon (gray) water from my bathtub on the third floor to water plants in the yard, not lack of moral fortitude. Great!

• jeremysmyth 11y ago
  No, unless the water had to rise 10m from your bathtub before descending. If it only had to rise enough to climb through a window before descending to your yard, then that is not enough to produce the problem in the article. The problem described is that water cannot be lifted up more than 10m (due to air pressure pushing on the bath side not exceeding the weight of 10m of water in the hosepipe), not pulled down on the far side.
  • basicplus2 11y ago
    yet but no.. 1. bottom of siphon outlet has to be sealed by the surface of water held in a container.. and 2. and height of long side must less that atmospheric pressure in height from said surface of water or water column on down side will break and draw will be lost
    • LeifCarrotson 11y ago
      But the bottom side of the siphon doesn't have to be the bottom of the system. Run the tube up 1m to the window and back down out the window perhaps 3m to a bucket on the porch roof - an easy, simple, working siphon. From that bucket, you can use a regular positive-pressure bottom drain to go down as far as you like.
• deleted 11y ago
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