International Commission on Irrigation & Drainage Commission Interationale des Irrigation et du Drainage

Multilingual Technical Dictionary (MTD)
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.

Compare with :French, Hindi, Russian, Japanese, Chinese, Base Language : English
Available languages :French, Hindi, Russian, Japanese, Chinese, Base Language : English

Last 10 definitions



Back