Irrigation Engineering
Seepage through embankments in an earthen dam is controlled by

drainage filters
provision of downstream berms
relief wells
drain trenches

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Irrigation Engineering
Lacy's regime condition is obtained if

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

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