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Waste Water Engineering

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

Chezy
Kutter
Bazin
Manning

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Waste Water Engineering
The sewer which collects the discharge from a collecting system and delivers it to a treatment plant, is known

Sewer outfall
Lateral sewer
Branch sewer
House sewer

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Waste Water Engineering
If the grit in grit chambers is 4.5 million litres per day, its cleaning is done

Hydraulically
Mechanically
Manually
Electrically

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Waste Water Engineering
‘Cowl’ is provided at

Lower end of ventilating column
First step in manhole
Upper end of ventilating column
Upper end of the manhole

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Waste Water Engineering
The ratio of maximum sewage flow to average sewage flow for trunk mains having diameters more than 1.25 m, is

2
4
3
1.5

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Waste Water Engineering
In sewers the gas generally found, is

Methane (CH4)
Hydrogen sulphide (H2S)
Carbon dioxide (CO2)
All listed here

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