Ambient activity track whose channel is self-built by the flow's own coarse fraction shearing out to the margins: surges deposit growth at the edges as they pass, the two levees narrow the channel over many surges, and once one bank critically narrows the flow breaches it and avulses sideways, leaving the old levee pair behind as a static scar.
pnpm dlx shadcn@latest add "https://design.helpmarq.com/r/mudflow-levee-build.json"