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Waste Water Engineering

Waste Water Engineering
In Chezy’s formula V = C rs for calculating the velocity of flow in circular sewer of diameter running full, the value of hydraulic mean radius is

D/2
D/3
D/4
D/1

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Waste Water Engineering
If the peak discharge of a storm water drain (S.W. Drain) is expected to exceed 150 cumecs, the free board to be provided, is

50 cm
90 cm
100 cm
80 cm

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Waste Water Engineering
Bottom openings 15 cm × 15 cm in the standing baffle wall are provided

22.5 cm c/c
50 cm c/c
15 cm c/c
30 cm c/c

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Waste Water Engineering
Sewer pipes are designed for maximum discharge with 25% to 33% vacant cross-sectional area for

Unexpected increase in the population
Unexpected large scale infiltration of stream water
All of these
Under estimates of maximum and average flows

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Waste Water Engineering
The most efficient cross-section of sewers in a combined sewerage system is

Parabolic
Rectangular
New egged
Circular

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Waste Water Engineering
¾th or ¼th extra space is left in sewer pipes at maximum discharge for

Unexpected increase in population
All listed here
Large scale infiltration of storm water
Low estimates of the average and maximum flows

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