This matches very closely to what I envisioned, but takes advantage of some different POVs then I was imagining, it has that movie quality cut work!

A violent teal-brown rocky slurry floods an old dry stream bed, thick with mud, gravel, stones, and churned sediment. The slurry surges downhill through the narrow channel, rapidly filling it from bank to bank as it rushes toward a much larger river. The flow is heavy and turbulent, frothing and rolling ...