R-View is a visual guide for selecting Manning’s roughness values in natural rivers and man-made channels using photographic information. It is based on U.S. Geological Survey’s publication entitled “Roughness Characteristics of Natural Channels” by Harry H. Barnes, Jr., Water Supply Paper 1849. R-view is intended for use by hydrologists, hydraulic engineers, geologists, geomorphologists, and practitioners of environmental engineering. In R-view a total of 100 photographic images is included to cover a wide range of channel conditions.
