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Focal Point Depth and Velocity.
From Everest and Chapman 1972
Notes:
These data, taken from Everest and Chapman (1972), indicate that steelhead seek deeper faster water as they increase in size. Thus, availability of deeper faster water can limit production of smolt-sized fish. At the typical length in late summer for age 1 parr steelhead (about of 12 cm), their preferred depth is roughly 0.8 m, which deeper than some pools and nearly all riffles