Pick up the correct statement from the following:
A. The sewer pipes of sizes less than 0.4 m diameter are designed as running full at maximum discharge
B. The sewer pipes of sizes greater than 0.4 m diameter are designed as running $${\frac{2}{3}^{{\text{rd}}}}$$ or $${\frac{3}{4}^{{\text{th}}}}$$ full at maximum discharge
C. The minimum design velocity of sewer pipes is taken as 0.8 m/sec
D. All the above
Answer: Option D
This Question Belongs to Civil Engineering >> Waste Water Engineering
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The effluent of a septic tank is
A. Fit for discharge into any open drain
B. Foul and contains dissolved and suspended solids
C. As good as that from a complete treatment
D. None of these
The bottom of the sewage inlet chamber of septic tanks, is provided an outward slope
A. 1 in 5
B. 1 in 10
C. 1 in 15
D. 1 in 20
Drop manholes are the manholes
A. Without entry ladders
B. Without manhole covers
C. With depths more than 3.5 m
D. Having drains at different levels
Only c options are correct
1. If dia of sewer is less than .4 mtr then jt will design for 1/2 of design discharge
2.IF dia between0.4-0.9 then design to 2/3 of design discharge
3 IF DIA IS MORE THAN 0.9Mtr then design for 3/4 of design discharge
4.the minimum velocity is .8 mtr per second
Design discharge is maximum hourly discharge