Kerwin, Why would you want to drain lines? My frost line is 24 inches. My water lines are installed 36+ inches below grade. I never drain my lines.
Without knowing what the lay out of your plans are, it's hard to say what will work best for you.
Going out on a limb and say your pump is in the well, tank is in basement and the line from the pump is 1 inch. I have the same set up. I installed a hydrant 150 ft from tank with 3/4 inch plastic. No problems, plenty of water. I have a hydrant at the well head too. Lots of water there too. I have a hose bib at house. I can run all 3 and have plenty of water. Just how good is your well? If your well can't put out lots of water, why use large pipe?
Would it save you trenching and pipe if you teed in at the well head? You don't have to go to the basement to run lines.
Do you plan to have all three hydrants going at the same time? If you do, can your pump handle all 3 at once? If it can't then what is the advantage of 3 different lines? Will you have to dig up more of your yard to run 3 lines? Will you save trenching running a main and having 3 branches?
I wouldn't use a pipe bigger than the pipe from your well to the house.
There is a lot you are not telling us. Guess there is no real simple answer.
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