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Gradient

Channel gradient (rise/run, m/m).
 
Reach gradient is calculated from digital elevation models (commonly 10-m DEMs or LiDAR DEMs) at the scale of channel segments (20 – 200 m). The DEM-inferred gradient using the DEM-delineated flow path uses a nine-point surface polynomial as described by Zevenbergen and Thorne (1987). See more.
 
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