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Irrigation Engineering

Irrigation Engineering
Canals taken off from ice-fed perennial rivers, are known

Permanent canals
Inundation canals
Ridge canals
Perennial canals

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Irrigation Engineering
The scour depth D of a river during flood, may be calculated from the Lacey's equation

D = 0.47 (Q/f)1/2
D = 0.47 (Q/f)2/3
D = 0.47 (Q/f)1/3
D = 0.47 (Q/f)

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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
Cross regulators in main canals are provided

To regulate water supply in the distributaries
To increase water head upstream when a main canal is running with low supplies
None of these
To overflow excessive flow water

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Irrigation Engineering
If Δ is the depth of water in metres, B is the number of days of base period and D is the duty in hectare/cumec, the relationship which holds good, is

B = Δ (8.64 B/D)
D = (8.6 Δ/B)
Δ = (8.6 B/D)
D = Δ (8.64 D/B)

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Irrigation Engineering
River training for depth is achieved by

construction of dykes or leavees
groynes and bandalling
groynes
both (A) and (B)

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