Channel Assessment Procedure Field Guidebook

[Table of Contents]

Appendix 2.

Diagnostic channel keys


Morphology:
Disturbance level:
Code:
Riffle-pool
Moderately aggraded
RPc-w: A2
RPc-w
A2




Relevant field indicators:
S2, S3, C2, C3, C4, B2, D2, D3
Generally:
Channel widening is evident over much of the channel length (>one-half reach length).
Pools are less frequent and shallow (<0.5 m in depth). Riffles make up over 50% of the channel length.
Side and mid-channel bars are more extensive.
Mid-channel bars are relatively high, with bar tops as high as banks.
LWD is less evenly distributed, often clumped into jams. Individual pieces are oriented parallel to the banks.

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