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What is the reason in checking the ratio (i.e. design flow to full-bore flow > 0.5) in circular pipe design?

For checking of self-cleansing velocity for pipes, there is another criterion to check design flow Q to full bore flow Qfull> 0.5. If this criterion is met, it can be deduced that the design flow is always greater than self-cleansing velocity.

The reason behind is that from the chart of circular pipes,
when Q/ Qfull>0.5,
then the ratio of design velocity V to full bore velocity Vfull >1.

After confirming Vfull>1m/s, then it leads to V>1m/s. Hence, minimum velocity at full bore flow should be checked.

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This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.

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Kanwarjot Singh

Kanwarjot Singh is the founder of Civil Engineering Portal, a leading civil engineering website which has been awarded as the best online publication by CIDC. He did his BE civil from Thapar University, Patiala and has been working on this website with his team of Civil Engineers.

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