Channel Assessment Procedure Field Guidebook

[Table of Contents]

Appendix 2.

Diagnostic channel keys


Morphology:
Disturbance level:
Code:
Step-pool
Partially degraded
SPb: D1
SPb
D1




Relevant field indicators: C5
Generally:
Boulder lines becoming less continuous (breaks in line) so the flow is around and over individual boulders.
Lines oriented more parallel to banks (less distinct diagonal crossing of lines).
Pool proportion is reduced to one-half to one-third of channel length.
Minimal bank erosion due to non-alluvial banks (bedrock).
Apparent movement of boulders (many without moss covering).

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