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Aug 19, 2016 at 21:26 comment added Gert The 'tank/not tank' question is a little subjective. If you can tap into the stream at sufficient depth air bubbles should not be an issue. Building a tank however is a complication best avoided where possible.
Aug 19, 2016 at 20:56 comment added Richard J Thanks Floris, I have to use a pipe to fill my tank. I will cut a hole near the top and another hole near the bottom to continue bringing my pipe downstream.So I hope that any bubbles will float to the top of the tank? My tank will be as near as I can get to my 100ft height. This is a practical water system that I am trying to create that needs physics done correctly to get a good outcome. I propose to use a 50gallon tank about 4ft tall. Thank you again so much for your input and I hope I get a successful outcome. :-)
Aug 19, 2016 at 20:44 comment added Floris You need the tank to maintain the pressure. If you look at the diagram in Gert's answer, you can see that you will get the same pressure as long as the surface of the water is at the same height. Now if you are catching water from a stream you may be trapping bubbles (lowering the apparent density) and a tank will allow the bubbles to go to the surface (water flows slowly in the tank, giving the bubbles time to "float upstream".) If you try to trap water from a stream straight in a tank you may be sucking in air - that would lower the density and thus pressure.
Aug 19, 2016 at 20:38 comment added Richard J Thank you Floris. But the tank is the key isn't it? Initially, I just had my 1" pipe in the stream hoping the height would give me great pressure but I think I need a tank to create the pressure, dont I
Aug 19, 2016 at 20:31 vote accept Richard J
Aug 19, 2016 at 1:26 history answered Floris CC BY-SA 3.0