The 'Kennedy''s silt theory' for canal design states that the critical velocity (V0) is:
Choose the correct answer
V0 = √(2gR) (critical speed only from gravity)
V0 = 0.55m × y^0.64 — velocity at which silt is neither deposited nor scoured (regime velocity)
V0 = k·Q^0.5
V0 = average velocity always 1 m/s
Correct Answer
B. V0 = 0.55m × y^0.64 — velocity at which silt is neither deposited nor scoured (regime velocity)
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Kennedy (1895): V0 = 0.55 m^0.64 × y^0.64 where m = critical velocity ratio (depends on silt grade), y = depth of water (m). V0 is the velocity at which neither silt deposits nor erosion occurs (regime condition). Lacey improved this by accounting for silt factor and regime cross-section more rigorously.
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