An uprooted shrub on a slope next to a cement wall revealed a black corrugated, hard yet slightly pliable, plastic… thing.
I’m not sure if it’s something broken, or if it’s supposed to be left alone. It’s not a pipe (doesn’t appear to have cylindrical shape) and it doesn’t drain into anything. It appears to go under the wall. This wall divides my yard from a busy street with a sidewalk.
Can someone identify it, tell me what it’s for?