Veronika, What I am basing my assumptions on are hydraulic theory and the work of Heron of Alexandria, http://en.wikipedia.org/wiki/Heron_of_alexandria. With his fountain (http://www.youtube.com/watch?v=2VyNln0T6Jc). What people have missed about his fountain is why it works. It uses 2 pressure heads that are separated by space. I used to think it was the volume of water until I did some testing and realized that I was missing something. This is when I realized that it was the height of the pressure head that mattered. You see, with his fountain, the taller pressure head generates slightly more force than the shorter pressure head. Because of this, the taller pressure head fills it's reservoir causing the water to be pumped out of the shorter reservoir. What I am suggesting that is different is using both the force and mass of the pressure head. Why I believe something like this would work is because the space between the 2 pressure heads would be an absolute vacuum. Because of this, the pressure head with more mass/volume should act upon the other pressure head. And this could only happen if it's height is sufficient to generate greater than atmospheric pressure. This latter part is what would allow it to drain and should allow for a continuous flow. A basic test would use pvc pipe that is about 10 cm and 5 cm pvc pipe with a connector pipe less that 10 cm's in length which has a T for filling and capping/plugging the test. Then the drain plug on the larger diameter pipe could be removed first and flow should be established, hopefully. I hope I have been able to better explain things to you.

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Veronika, What I am basing my assumptions on are hydraulic theory and the work of Heron of Alexandria, http://en.wikipedia.org/wiki/Heron_of_alexandria. With his fountain (http://www.youtube.com/watch?v=2VyNln0T6Jc). What people have missed about his fountain is why it works. It uses 2 pressure heads that are separated by space. I used to think it was the volume of water until I did some testing and realized that I was missing something. This is when I realized that it was the height of the pressure head that mattered. You see, with his fountain, the taller pressure head generates slightly more force than the shorter pressure head. Because of this, the taller pressure head fills it's reservoir causing the water to be pumped out of the shorter reservoir. What I am suggesting that is different is using both the force and mass of the pressure head. Why I believe something like this would work is because the space between the 2 pressure heads would be an absolute vacuum. Because of this, the pressure head with more mass/volume should act upon the other pressure head. And this could only happen if it's height is sufficient to generate greater than atmospheric pressure. This latter part is what would allow it to drain and should allow for a continuous flow. A basic test would use pvc pipe that is about 10 cm and 5 cm pvc pipe with a connector pipe less that 10 cm's in length which has a T for filling and capping/plugging the test. Then the drain plug on the larger diameter pipe could be removed first and flow should be established, hopefully. I hope I have been able to better explain things to you.