The 'Lacey''s regime theory' for stable channel design specifies:
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Only channel slope for a given discharge
Complete regime channel dimensions (V, A, P, R, S) as functions of discharge Q and silt factor f
Only the canal width
Seasonal variation of silt transport
Correct Answer
B. Complete regime channel dimensions (V, A, P, R, S) as functions of discharge Q and silt factor f
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Lacey (1930): a channel in regime has stable section with no silting or scouring. Equations: V = 0.447√(fR); A = 2.64Q^0.83; P = 4.75√Q; R = 0.47(Q/f)^(1/3); S = f^5/3/(3340Q^(1/6)) where f = silt factor, Q = discharge, R = hydraulic radius, P = wetted perimeter. All geometrical parameters related to Q and f.
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