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Waste Water Engineering

Waste Water Engineering
The small sewers are cleaned by

Flushing
Wooden pills
Cane rodding
None of these

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Waste Water Engineering
hydraulically equivalent, the relationship which holds good, is

D2/3 = 4 b2/3
D3/2 = 4 b3/2
D3/8 = 4 b3/8
D8/3 = 4 b8/3

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Waste Water Engineering
For providing an Indian type W.C., the R.C.C. slabs in the toilet portion

Need not be sunk
Should be sunk by 20 cm
Should be sunk by 50 cm
Should be kept 20 cm above the adjacent portion

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Waste Water Engineering
In case of Imhoff tanks,

The velocity of flow is restricted to 0.30 m/minute
All of these
The shape is rectangular
Detention period is 2 hours

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Waste Water Engineering
If is the rugosity coefficient, is the bed slope of sewer, the velocity of flow in m/sec may be obtained by the formula V = (1/n) r2/3 s1/2 evolved by

Bazin
Kutter
Manning
Chezy

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Waste Water Engineering
In septic tanks, decomposition of organic bacteria, is done by

Anaerobic bacteria
Aerobic bacteria
Both types of bacterias
None of these

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