Good catch. That is a drain pipe that normally would go to the sidewall outlet. The connecting pipe to the left sidewall outlet was broken away from this point from either the backfill erosion damage and/or from the sidewall & slab shift.
The video only gives a good view of the right sidewall drains. So this "catch" on this drain demonstrates there is water penetration about 100 to 200 ft further up the spillway -OR- there is a subsurface flow that is coming from an unexpected "piping" path within the lower rock. Something to keep an eye on.
no I’m not so sure..if this video the white that looks like a stream of water is clearly a tube..
https://www.youtube.com/watch?v=dVuOYXOQHp0&feature=youtu.be
the video I posted is after this but is the mist just giving an illusion of water flowing ?or is actual water flowing out it?