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Explaining Rosgen Classification

Exercise Objective

To assess the earlier Rosgen classification of Reaches based on described fluvial geomorphologic characteristics.

Exercise Explanation

1. The first statement of a Reach with an Entrenchment Ratio greater than 2.2, width to depth ratio less than 12, Sinuosity greater than 1.5, and slopes less than 0.02 is an E channel. Sand substrate is a class 5. The Stream Reach is an E5.
2. The second statement of a Reach with an Entrenchment Ratio less than 1.4, width to depth ratio less than 12, Sinuosity greater than 1.2, and slopes less than 0.02 is an F channel. Cobble substrate is a class 3. The Stream Reach is an F3.

Image courtesy of Rosgen

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