Irrigation Engineering
In case of a trapezoidal notch fall

Splay upstream from the notch section is 45°
All listed here
Splay downstream from the notch section is 22½°
Top length of the piers should not be less than their thickness

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Irrigation Engineering
Lane's weighted creep theory assumes

Equal weightage to horizontal and vertical creeps
Triple weightage to vertical creep and one weightage to horizontal creep
Double weightage to horizontal creep and one weightage to vertical creep
Triple weightage to horizontal creep and one weightage to vertical creep

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Irrigation Engineering
As per Lacey’s theory, the silt factor is

not related to average particle size
directly proportional to square root of average particle size
inversely proportional to average par¬ticle size
directly proportional to average par¬ticle size

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