According to Kennedy the silting action in channel is due to ?

Explanation:

Kennedy's theory: 

Kennedy study the silting and flow behavior of Upper Bari Doab Canal  system in Punjab and gives following observations:

• Silt supporting power of a channel is due to eddies formed at the bed of channel and reaching to the surface, these eddies formed on horizontal surface.
• Due to eddy formation silt particle subjected to force in upward direction at the same time a force act in downward direction due to its own weight, thus net force acting on the silt particle is zero and silt particle remain in suspension.

• The velocity of flow at which silt particle remain in suspension and no silting occurs is called critical velocity of flow (V0).

          \(V_{o}=C_{1}y^{c_{2}}\)  ,  Where C1 and C2 are constant and depends upon type of silt. (C1= 0.55 & C2 =0.65) and y = Depth of flow

• The above expression is valid for Upper bari doab canal only therefore for other canal a constant termed as critical velocity ratio (m) is given by Kennedy, which depends upon silt grade and type of silt.
• Now Critical Velocity is given by \(V_{o}=0.55my^{0.65}\)
• For canal design Kennedy considered trapezoidal section, While Lacey considered Semi elliptical section.