A headcut control structure where the face of the headcut has been laid back to a ROCK MULCH RUNDOWN A headcut control structure where the face of the headcut has been laid back to a stable angle of repose (minimum of a 3:1 slope), and then covered with a single layer of rock mulch. The mulch serves to slow runoff, increase soil moisture, recruit vegetation, and ultimately prevent the headcut from migrating further up slope. Rock Mulch Rundowns are to be used ONLY on low energy headcuts, like those found in uplands rills and gullies with small catchment areas, and where sheetflow collects and enters a channel.