Troy Rhodes wrote:36 meters.
Your tank has to be 36 meters higher (absolute vertical height difference, not the length/distance up the hill, which will be much longer than 36 meters.) than the point where the water comes out of the faucet to end up with 3.5 barrs pressure.
The size of the pipe has no effect on those numbers at all, the end.
That's about the height of a 10 story building just to get a feel for the scale of that height difference.
Ahhh...but if you want a good flow rate, you had better make the pipe 25 to 32 mm or more, inside diameter to preserve good flow rates.
There, not so complicated now.
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