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Which one of the following is INCORRECT about design consideration of sewers system?

Which one of the following is INCORRECT about design consideration of sewers system? Correct Answer The quantity of sanitary sewage and industrial waste is proportional to the water supplied by public supply

Explanation:

Design of sewer system:

1) Sewers are designed to full flow, when discharging the maximum flow.

2) Sanitary sewers are designed for self-cleaning velocity of 60 cm/sec and combined sewers for velocity of 75 - 90 cm/sec

3) Minimum size of sewers to be used to 15 cm.

4) Manholes should be provided at intersection, at change of gradient and their spacing in no case be greater than 120 m.

5) Deep of about 12 mm is given in manhole, where any direction changes.

6) Design period of sewage system is 25 years.

7) Sewage in combined system should be capable of carrying at least 2 times the dry weather flow in addition to the stormwater.

Note: Industrial waste does not depends on public water supply, as the water supplied to the industry is not same as the water supplied to the city for normal usage, as industries are located outside of the city, and demand of water for industry is not different from our daily usage.

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