My way of looking at this... if you bury three lines in one trench you have three lines and three times as many connections that could possibly leak. I'd go with one larger diameter pipe throughout and don't step it down until it gets above grade in the building. You don't know what your requirements are going to be down the road and one large line will flow more water than 3 small ones. I'd go with 1-1/4" at minimum. 1-1/2" if the price is not too outrageous. We've got stuff around here buried that ranges from 1/2" to 1-1/4".... and I'm sorry to say I wish it was all 1-1/4". larger pipe is also thicker and will withstand rock better. Use stainless connectors and clamps. Galvanized will rust... The larger line will have FAR less friction loss than 3 smaller lines.
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