I am starting a homeowner system and need some help getting started. I was told to cut into the 1 inch copper line just ahead of my 3/4 meter. I put a "T" in the line. From that I ran a psi gauge and down from that a stop valve. Then another right angle down to drain into a 5 gal bucket. I ran 3 tests. The static pressure is 56 psi. I tested the flow at 50 psi = 12.5 gpm, 45 psi = 16.5 gpm, and 40 psi = 21.4 gpm. QUESTIONS: First was I correct to do this, if so, now what do I do. Which of these numbers do I use to configure the system. I was going to run the system main with 1 inch copper and the laterals with 3/4 poly. Is that correct? What should I use? I read that the gpm should be around 18. I have glanced at the irrigation tutorial and it is alittle confusing. Any advice to get me in the right direction would be greatly appreciated. I tried to attach a drawing of what I did.