I have lived here over 20 years, but I still make new discoveries. At the site of an old homestead on my property, I just discovered maybe fifty 10ft lengths of flexible black poly pipe. It is deep in the woods, so has not been exposed to the sun, but it is probably around 40 years old or more. It is off the ground, looped over an old fence, with vines growing all over it. I didn't measure, but it is probably 1 1 /4 inch. Can it be used for anything?
Good decisions come from experience. Experience comes from making bad decisions. Mark Twain
Hard to make a long line with 10ft lengths; it would cost more in fittings than new poly, and decades of UV make integrity a concern. Fine for a gravity drain though; you can just tape the joints together. Could be perforated for a crude leach field. Great for protecting shallow electrical lines against physical damage, or placing as a shallow "early warning" above deeper lines. Would be great as sun-heated air convection tubes to keep an outhouse pit dry and un-smelly. Good size for a solarwater heater setup, or a solar heating wall in a garage/shed. Fill with linseed oil to soak thin handles on garden tools. Add a plastic foot valve and it might work as a siphon for emptying water tanks (tricky). Insert a short length in the ground, down to the root zone of a tree for deep and efficient watering.
Do you use electric fencing/netting? I've seen old pipe of various sorts used over top of steel pipe or posts to create an insulated fencepost; just have to devise a way to keep the charged wire/mesh from sliding down.
'Theoretically this level of creeping Orwellian dynamics should ramp up our awareness, but what happens instead is that each alert becomes less and less effective because we're incredibly stupid.' - Jerry Holkins
We end up using shorter pieces of black poly for hoop houses in the garden. We use them every 2-3 feet and than place used clear plastic over top of them. We only really use it in the fall/spring to either warm up some soil or to keep some plants from getting frosted. If need be we can also place a garden blanket over the bed without squishing the plants below.
We stick metal rods into the ends and put one on either end of the bed. It can also be used with mesh/remay and placed over strawberries to keep the birds off.