Channel Assessment Procedure Field Guidebook

[Table of Contents]

Appendix 2.

Diagnostic channel keys


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




Relevant field indicators:
S2, S3, S4, 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 deep).
Riffles make up over 50% of the channel length.
Side and mid-channel bars are more extensive and relatively high, with bar tops as high as bank tops.
The distribution of LWD is uneven, oriented parallel to the banks, and often clumped into jams.

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