Channel Assessment Procedure Field Guidebook

[Table of Contents]

Appendix 2.

Diagnostic channel keys


Morphology:
Disturbance level:
Code:
Step-pool
Partially aggraded
SPr: A1
SPb
A1




Relevant field indicators: S4
Generally:
Interlocking boulders are intact but intervening pools have evidence of infilling (recently deposited cobbles, boulders, and fine-textured sediments—all loosely packed and devoid of mosses or algaes).
Stream flow continues to drop over steps and decelerate through pools during low flow.
Banks do not erode due to non-alluvial materials.
Recently deposited sediments are located along the bank tops.

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