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3082. Lacey`s equation : An empirical equation for alluvial channel. Equation propounded by Lacey for design of channels designs that relates regime velocity, slope and sediment characteristics as : 1 V = --- . R3/4 S1/2 Na wherein the absolute roughness coefficient Na = 0.0225f1/4 in which Lacey’s silt factor f = 1.76d1/2, d being mean diameter of the sediment in mm, R is hydraulic mean radius (m), and S is slope. | ||