Irrigation Engineering
For the upstream face of an earthen dam, the most adverse condition for stability of slope is

sloughing of slope
steady seepage
sudden drawdown
during construction

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Irrigation Engineering
Lacy's regime condition is obtained if

Silt grade in the channel is variable
Silt charge in the channel is variable
Discharge in the channel is variable
Channel flows in unlimited, incoherent alluvium of the same character as that transported material

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