Hello everyone i have an opportunity to take on a large irrigation project. There is a roadway that needs to get water on both sides of the road and it is 2500 feet long. My questions concerns the size pipe i will need to carry constant water the whole length. i hope that 4 inch sch 40 pvc will be sufficiant as a main line. Assume the zones will be 1 inch poly. There will be a 40-45 gpm provided. thanks for the help as this site is great assurance.