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Williams River

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Record: 17    Segment ID: M19-    Stream Name: Williams River

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NOTE: Enter the Confinement Evaluated first, then the Scores, then the rest.

Rapid Geomorphic Assessment  
  Confinement Evaluated Unconfined  
  Geomorphic Assessment Scores
  Score STD (7.5) Historic (7.5)
7.1 Channel Degradation 6 C to B Yes
7.2 Channel Aggradation 11 None No
7.3 Widening Channel 11 None No
7.4 Change in Planform 10 None No
  Total Score 38  
  Condition Rating 0.47  
7.5 Channel Evolution Model F  
  Channel Evolution Stage IV  
7.6 Geomorphic Stream Condition Fair  
7.7 Stream Sensitivity High  
7.5 Channel Adjustment Processes Narrative  
  Large volumes of cobble and gravel from T.S. Irene are working through the segment. The historic encroachment of Smokeshire Rd has caused incision, but during T.S. Irene the channel widened scouring away the low benches before filling the channel with deposits. By reference this segment would be C-type in a narrow valley, however encroachment from Smokeshire has caused a departure to Bc in a semi confined valley. Currently the channel has aggraded from the deposition left behind by T.S. Irene and is working through the material by creating multiple mid-channel and side bars. The consistent scour and aggradation observed within the reach suggests a stage IV channel evolution stage.