How Robinsong applied Rosgen's Natural Channel Design Techniques to help shape a community's future Rosgen Natural Channel Design Techniques are founded upon the study of natural streams and how they maintain their health by creating for themselves predictable channel patterns and geometry, depth and slope, in response to flow rates, rock and pebble size, and sediment load. These parameters combined with soil properties and the land topology to determine what types of meanders should be built into a stable, healthy restored stream. This type of scientific “makeover” of impaired streams is now mandated by the U.S. Army Corps of Engineers in their stream mitigation guidance per a letter of regulatory guidance in 2001.