Stream Type A2a+
A2a+ Description:

- Very steep, straight, narrow, cascading, step-pool Streams
- Extremely high energy/debris transport
- Entrenchment: Entrenched, Ratio < 1.4
- Water Surface Slope/Gradient: >10%
- Dominant Substrate Particle Size: Predominantly boulders
- Width/Depth Ratio: < 12
- Sinuosity: < 1.2

Image courtesy of Rosgen
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