Channel Assessment Procedure Field Guidebook

[Table of Contents]

Appendix 2.

Diagnostic channel keys


Morphology:
Disturbance level:
Code:
Riffle-pool
Partially degraded
RPg-w: D1
RPg-w
D1




Relevant field indicators:
S5, C1, D2
Generally:
Channel is complex with diverse pool and riffle shapes, undercut banks, and LWD functions (LWD interacts with flow of water and sedimentation).
Pools make up one-half to one-third of channel length.
Pool depth is reduced by degradation of riffle crests (pool depth approximately 0.25 to 1 m).
Riffle texture is coarse as sediment is eroded.
LWD influences bed and bank conditions.

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