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On what condition does the resistance equations...

On what condition does the resistance equations of Chezy’s formula and manning’s formula are applicable?

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asked Aug 16, 2023 in Irrigation Engineering by Carter (75.2k points)

On what condition does the resistance equations of Chezy’s formula and manning’s formula are applicable?

(a) τo

(b) τc

(c) τo < τc

(d) τo > τc

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This interesting question is from Stable Channels Design in India in section Sediment Transport and Irrigation Channels Design of Irrigation Engineering

irrigation engineering
sediment transport and irrigation channels design
stable channels design in india

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1 Answer

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answered Aug 16, 2023 by Greg (106k points)

Correct answer is (c) τo < τc

To elaborate: The average shear stress (τo) which is acting on the boundary of an alluvial channel should be less than the critical shear stress (τc), then the channel shape remains unchanged, and hence the channel is considered having rigid boundary. So based on this condition Chezy’s formula and Manning’s formula can be applied.

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