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Bray and Davar 1: These three best fit equations were obtained based on in-bank flows corresponding to 2-year flood flows from 67 gravel-bed river reaches in Alberta, Canada (Bray, 1979). These three equations are used for estimating average velocity for high in-bank flows in gravel-bed rivers and the authors suggested that two or more independent approaches should be used and that the results should be compared.

Reference:
Bray, D.I., and Davar, K.S., 1987, Resistance to flow in gravel-bed rivers; Canadian Journal of Civil Engineering, volume 14, pp 77-86.

Bray, D.I., 1979, Estimating Average Velocity in Gravel-Bed River: Journal of the Hydraulics Division, Proceedings of the American Society of Civil Engineers, vol. 105, no. HY9, September, 1979: pp. 1103-1122.