The 'Kennedy''s silt theory' for canal design states that:
Choose the correct answer
Silt factor depends on grain size of material
Critical (non-silting, non-scouring) velocity V0 = 0.55m×y^0.64 where m = silt factor, y = depth of flow
Silt settles whenever velocity exceeds 0.55 m/s
Canal must flow at full supply depth always
Correct Answer
B. Critical (non-silting, non-scouring) velocity V0 = 0.55m×y^0.64 where m = silt factor, y = depth of flow
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Kennedy (1895, from Upper Bari Doab Canal): critical velocity V0 = 0.55 m × y^0.64 where m = channel-soil factor (1.0 for standard, varies 0.7–1.2), y = depth of flow. When actual V = V0: neither silt deposited nor scoured. Limitation: only one variable (depth) but two unknowns (B, y). Kutter''s formula for n and S also needed. Improved by Lacey''s regime theory which adds all cross-section variables.
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