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Irrigation Engineering

Irrigation Engineering
In a canal syphon, the flow is

With critical velocity
Under negative pressure
Pipe flow
Under atmospheric pressure

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Irrigation Engineering
Canals constructed for draining off water from water logged areas, are known

Contour canals
Inundation canals
Drains
Valley canals

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Irrigation Engineering
The crest level of a canal diversion head work, depends upon

Pond level
Discharge perimeters
All listed here
F.S.L. of the canal

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Irrigation Engineering
Unit of runoff in M.K.S. system is

cubic metre/sec
square metre
metre/sec
cubic metre

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Irrigation Engineering
If the height of the hydraulic gradient line above the floor of thickness t is h and the specific gravity of the material of the floor is G, the minimum thickness t of the floor downstream of the crest-wall, is given by the equation

t = (h + 1)/G
t = (h - 1)/(G - t)
t = (h - 1)/(G + t)
t = (h + 1)/(G + t)

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Irrigation Engineering
As compared to crest of the normal portion of the weir, the crest of the under sluice portion of weir is kept at

any of the above depending on the design
higher level
lower level
same level

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