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As an example, I think a typical 90 elbow is equal to adding an additional 1 foot of pipe. You'd have to find charts for the pipe you are using (for the real answer might be something like 3ft).

So as an example, let's assume that for a given gpm, the tables tell you that a 90 elbow = 2ft and pressure loss is 5psi/100'.

You run a pipe across the front yard for a distance of 50', then you turn 90 to the right and go strait for 10', then you turn 90 to the left and go strait for a distance of 5' (your trying to go around an obstical), then you turn left for another 90 and go back 10', then turn 90 to the right (so that you are back on your previous course). You then have to go another 40' to reach where ever you are trying to go.

Total distance is 50 + 2 + 10 + 2 + 5 + 2 + 10 + 2 + 40 = 123ft

123ft * 5psi/100ft = 6.15psi pressure loss.

So the comprimise is to run as many tees as needed so that the total pipe used is minimized. (i.e. the pipe should be in H and T shapes, Not S shapes.