开云体育

I think you can make falling water get you that kind of vacuum.
You would need a thicker pipe where you spray water downwards, then a funnel shape at the bottom of that and connect it to a hose. A bit like a oil diffusion pump, just vertical.
The hose need to have at least 11m drop so it can pull some air with it on its way down. It also got to be just the right thickness to trap the air and also allow for a decent flow.
The drop could be a hill, it's the vertical distance that counts.

I can think of all kinds of problems with this design, but it's simple enough that you can power it all by hand. Making it more reliable will need a lot of tinkering. Also, it needs icy cold water (: