My guess is the area is pretty sloped. It's probably near the same depth as sewage, and sewage always has to run downhill (until it reaches a lift). This can cause some pipes to be pretty deep.
Probably both, like maybe in Colorado or Appalachia.
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My guess is the area is pretty sloped. It's probably near the same depth as sewage, and sewage always has to run downhill (until it reaches a lift). This can cause some pipes to be pretty deep.
Probably both, like maybe in Colorado or Appalachia.