drawbacks in Kennedy’s theory

Give brief account of the drawbacks in Kennedy’s theory.

Drawbacks of Kennedy’s theory:-

Kennedy assumed that eddy current in channel arises only due to roughness of channel bed.

•  This theory is applicable only for those channels which carry certain amount of silt.

•  This theory is applicable only for regime channels.

•  The channel width (B) and depth of flow (y) has no significance in this theory.

•  It is a trial and error based design approach.

•  There is no logical basis for assigning the values of ‘m’ (critical Velocity Ratio i.e. CVR) to different types of soil and the phenomenon of silt transportation is no properly accounted for.

•  It assumes that silt carried in the flowing water by the vertical eddies generated from the channel bed only actually eddied get generated from the entire wetted perimeter of the channel.

•  This theory gives no expression for determining the channel bed slope.

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