I am putting in new irrigation and supply lines for my remodeled backyard and I've done my homework on water pipe sizing, but I'm left wondering if I'm installing too big of a pipe onto the main. The main is 3/4" at about 110psi from the street and 65psi after the pressure regulator. I guess I could connect either before or after the bell.
It's 160 feet from the main to my pool. Along this 160' 3 different hose bibs are stubbed off. At the pool I feed (1) a 3/4" PVC pool filler, (2) a 3/4" supply line to an outdoor shower, (3) 6x 3/4" PVC drip irrigation lines that travel up to 100' away but need pressure to weep out, and (4) 2x more hose bibs.
As I write this, it sounds like overkill on paper, but I actually want to leave some room for expansion including adding an outdoor kitchen or more irrigation lines someday.
I have studied the tables and my math came up with around 44 Water Supply Fixture Units (WSFUs), but there was some guessing with the drip irrigation. That works out to an undersized 1-1/4" PVC line (purple) for the main feed line and 3/4" PVC lines (blue) for the supply lines, all potable. My plan was to use 1-1/2" potable PVC since I need more than the chart called out and I want to be able to expand later. The problem is that the tables don't have 3/4" main and 1-1/2" supply as an option.
Am I looking at this the right way? Can you have too big of a supply line coming off of the main? Any help or insights would be greatly appreciated.