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I was cleaning the crawlspace under the house and discovered two 3/4 inch white PVC pipes that run across the crawlspace buried under ground (4-8 inch deep) and terminate at the perimeter foundation footing.

One of the pipes has a T-connection in the middle facing upwards, the top end is not capped and is filled with dirt.

I wonder if this was done on purpose (for some kind of drainage or something) or this is a part of abandoned yard irrigation system left by when they build a house addition

Does anybody know any method that would require such PVC pipes underground in the crawslapce?

Pipe: enter image description here

T-connection: enter image description here

Pipe ends at foundation footer (next to the pipe is a big root that goes under foundation as it seems) enter image description here

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Since its under an addition I think your guess about being part of an irrigation system that was abandoned is the most probable.

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  • I've never seen residential irrigation systems with pipes that large and why would there be two? Hot-Cold? Send-Return?
    – Steve Wellens
    Dec 23, 2018 at 17:21
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    @SteveWellens 3/4" PVC is very common for irrigation in Texas, and the two pipes would likely serve 2 different zones. Zone controllers are typically buried in groups, so you'd see multiple pipes leading out from a common location to each of the zones served.
    – mmathis
    Dec 23, 2018 at 20:43
  • I use 3/4 for main lines to the valves and if a larger zone to reduce pressure drop so this is not uncommon at all.
    – Ed Beal
    Dec 23, 2018 at 20:46
  • If it was for irrigation water supply, wouldn't one 1 1/2 " pipe be more reasonable? (Rather than running 2 3/4" pipes). I've seen people run pipes for future cables (AC Power, network, CATV). There would be two pipes because you don't want AC next to your network cable in the same pipe.
    – Steve Wellens
    Dec 24, 2018 at 4:52
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    Multiple zones are run all the time using 1/2 " pipe limits the number of sprinklers, my last home had 6 zones but because of the size I could only run 2 at a time and that was with 3/4" if I had used 1/2" I would have needed at least 3 more zones (more output modules and valves) to do the same job so 3/4 " was actually cheaper.
    – Ed Beal
    Dec 24, 2018 at 17:49

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