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Abstract
Color photographs and descriptive data are presented for 50 stream
channels for which roughness coefficients have been determined.
All hydraulic computations involving flow in open channels require
an evaluation of the hydraulic characteristics of the channel.
In the absence of a satisfactory quantitive procedure this evaluation
remains chiefly an art. The ability to evaluate roughness
coefficients must be developed through experience. One means of gaining
this experience is by examining and becoming acquainted with the
appearance of some typical channels whose roughness coefficients are known.
The photographs and data contained in this report represent a wide
range of channel conditions. Familiarity with the appearance, geometry,
and roughness characteristics of these channels will improve
the engineers's ability to select roughness coefficients for other channels.
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