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Irrigation Engineering

Irrigation Engineering
The water utilizable by plants is available in soils mainly in the form of

hydroscopic water
gravity water
chemical water
capillary water

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Irrigation Engineering
A minimum of 90 cm free board is provided if the discharge in the canal is between

Over 60 cumecs
30 to 33 cumecs
Over 100 cumecs
30 to 60 cumecs

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Irrigation Engineering
For the design of major hydraulic structures on the canals, the method generally preferred to, is based on

Electrical analogy method
The relaxation method
Khosla's method of independent variables
Bligh's theory

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Irrigation Engineering
Seepage through foundation in an earthen dam is controlled by providing

impervious cut off
chimney drain
horizontal blanket
rock toe

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Irrigation Engineering
Generally the weir is aligned at right angles to the direction of the main river current because

It is economical
All of these
It ensures less length of the weir
It gives better discharging capacity

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Irrigation Engineering
Finally formed berms in canals are provided for

Protection of banks erosion by the waves
All of these
Control of seepage losses
Strengthening of banks

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