How Robinsong applied Rosgen's Natural Channel Design Techniques to help shape a community's future Robinsong used 3,000 tons or rock in the restoration of the Brier Fork. Knowing exactly where and how to create vital stream features…. ripples, pools, meanders, in-stream structures… is at the heart of the science of Natural Channel Design Techniques, Rosgen’s gift to the current generation of stream restoration specialists. Robinsong was—and remains—the only mitigation provider in the area with experience in Rosgen’s Natural Channel Design Techniques.