Irrigation Engineering
If the risk of a flood occurring in the next 10 years is accepted to 10%, then the return period for design should be

1 + (0.9)010
1/(1+ 0.9010)
1/(1-0.9°10)
1 – (0.9)°l0

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Irrigation Engineering
A divide wall is provided

Parallel to the axis of weir and upstream of it
At right angle to the axis of weir
At an inclination to the axis of weir
Parallel to the axis of weir and downstream of it

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Irrigation Engineering
The intensity of irrigation means

Percentage of gross commanded area to be irrigated annually
Total depth of water supplied by the number of waterings
Percentage of the mean of culturable commanded area and the gross commanded area to be irrigated annually
Percentage of culturable commanded area to be irrigated annually

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

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