Depends. If you are a 6' 6" football player, no. If you are 72 years old and weigh 98 pounds, maybe.
Should be OK. Read up on sprinklers, installation, blowing the water out for winter etc.
Tubing bends.
I don't know what a fiel line is. If it is anything like a fuel line, you surely don't want to cut them. Depends on the depth how you would get around, over, or under them.
You will need to get this below freeze level for your area or you will need to make provisions for blowing the water out of the line each Fall.
A ditch witch is only slightly more difficult than a tiller once you get the hang of using it. It is about the only method I would use to dig a 250' ditch.
The use of a 1" poly pipe will allow you to bend the pipe around and large trees or to achieve the alignment you want. The 1" poly will act as a small storage tank so when you convert back to 3/4" for the faucet you may have better flow and pressure than you started with.
Your field lines may be a problem. Do you know how deep they are at the point you must cross? You really should not mess with them if your septic system is working correctly. Poly pipe is cheap and the witch is fun to use maybe you could go around the field. A lot of this depends on the freeze level for your area.
Simple. You add a shut off valve, back-flow preventer and buy whatever adaptors are needed. There is a safe legal way to go from whatever you have to the poly pipe. Post back the size of the line you are tapping into and I or some one else will try to name the parts you need for conversion. You should use metal pipe until you are below grade.
Ditch Witch makes a number of different sized machines. Everything from smaller walk behinds to very large ride-on tractors. To dig something that long, make sure you don't rent one of the very small machines made by GroundHog or Veneer. These things are moved by you and not the engine. The larger the machine, the less work it is. The larger Ditch Witch walk-behind models are not only self-propelled, but also steerable. If you are not going in a straight line, you might consider one of the steerable machines if they are available for rent in your area. If the ground is fairly flat and landscaped, you shouldn't have much trouble with a large machine. If you are working on muddy or uneven ground, the smaller non-steerable versions can be difficult to maneuver. The other day I was watching a very well built 240 pound 30 year old landscaper working down the street with a non-steerable Ditch Witch model
1300. He was having a very difficult time with the machine and complaining that a steerable version wasn't available for rent.
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