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Jarrett: Developed from 75 observations at 21 steep streams with cobble and small boulder beds in Colorado.

Reference:
Jarrett, R.D., 1984, Hydraulics of high-gradient streams: Journal of Hydraulic Engineering, American Society of Civil Engineers, V.110, no.HY11, pp: 1519-1539.

n N-value.
S Energy slope, in feet per feet, 0.002 < S < 0.09.
R Hydraulic radius in feet, 0.5 < R < 7
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