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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?

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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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