Irrigation Engineering
In case of non-availability of space due to topography, the most suitable spillway is

straight drop spillway
shaft spillway
ogee spillway
chute spillway

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Irrigation Engineering
Lacy's regime condition is obtained if

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

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