Irrigation Engineering
The aqueduct or superpassage type of works are generally used when

high flood drainage discharge is large and short lived
high flood drainage discharge is small
high flood drainage discharge is large and continues for a long time
None of these

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

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

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