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Williams River

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Record: 48    Segment ID: T5.S3.01-    Stream Name: Andover Brook

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Stream Channel  
2.1 Bankfull Width 63 ft.
2.2 Maximum Depth 2.7 ft.
2.3 Mean Depth 1.7 ft.
2.4 Floodprone Width 82 ft.
2.5 Recently Abandoned Floodplain 4.7 ft.
  Human Elevated Floodplain ft.
2.6 Width/Depth Ratio 36.8
2.7 Entrenchment Ratio 1.3
2.8 Incision Ratio - Redently Abandoned Floodplain 1.7
  Incision Ratio - Human Elevated FloodPlain 0.0
2.9 Sinuosity Low
2.10 Type of Riffles Sedimented
2.11 Riffle/Step Spacing Distance 100 ft.
2.12 Substrate Composition  
  Bedrock 0.0 %
  Boulder 10.0 %
  Cobble 46.0 %
  Course Gravel 12.0 %
  Fine Gravel 23.0 %
  Sand 9.0 %
  Silt and smaller 0.0 %
  Clay Present? Yes
  Percent Detritus 5.0 %
  Large Woody Debris Count 86
2.13 Average Largest Particle On  
  Bed 250 mm
  Bar 120 mm
2.14 Phase 2 Stream Type  
  Stream Type F
  Bed Material Cobble
  Subclass Slope None
  Dominant Bed Form Riffle-Pool
  SubDominant Bed Form
  Field Measured Slope
  Phase 1 Stream Type  
  Stream Type C
  Dominant Bed Material Cobble
  Subclass Slope None
  Bed Form Riffle-Pool
  Sub-reach Stream Type  
  Reference Stream Type
  Reference Bed Material
  Reference Subclass Slope
  Reference Bedform
  Were Channel Dimensions Significantly Changed By Major Flooding Yes
  Were channel dimensions significantly changed by human alteration associated with flood recovery efforts (e.g., reshaping of banks by yellow machines)? No
  Channel Enlargement 56 %
  Comments The cross section channel geometry was representative for the reach, however the valley width at the cross-section is wider than typical for the reach. Entrenchment ratio is low causing a STD to F-type however the reach is widened approximately 50% over curve width and retains moderate floodplain access.