the problem i have seen with a plow is that you can cut your pipe pretty easially. if the plow skirts a rock or sharp object, then the rest of the legnth of pipe would scrape it.
I have installed over 200 systems in all types of soil and never had that problem, or ever heard of that happening .
also if you cut something with a trencher you know where it is cut. I have seen cable guys here pull 50 feet of pvc out of the ground. it was our irrigation line. we had a heck of a time finding the end.
If you cut something , than it wasnt marked correctly by the locating company , or the machine operator screwed up . It happens both ways . If I cut something that isnt marked its not my responsibility
also
plowing is not THAT much of a time savings, brcuase you have to carefully dig out each tap in.
with my mini trencher, i have all my pipe and fittings glued on and just lay them in the trench. backfilling does not take that long to do.
This I strongly disagree with , after the pipe is pulled , it takes on adverage less than 10 minutes per head , thats dig, connect , fill and tamp . Backfilling a trench and compacting the soil takes quite a while compared to plowing and digging a small hole to make a connection .
that's the only time savings, is the backfill. i think a lot of that is offset by the digging of each fitting.
This I have to disagree with also , a plow and a trencher side by side on a 500 foot run with 10 heads 12 inches deep , clay loam soil using 1 inch poly , the man on the plow will be done in less than 1/3 the time, and look better when done .
also when you have to tee in, that is MUCH more time consuming than a tee with trenching.
That takes about 3 minutes longer than making a head connection , and 99 % of the time you plan your tee where a head goes , 1 hole serves 2 purposes.
no i cannot argue that it is less dammaging, but my little 2 inch trench grows in in a month or so. All the warm season grasses will spread over the trenches, so here there is no need to reseed.