+1 vote
in Irrigation Engineering by (75.2k points)
Calculate the Manning’s rugosity coefficient in a coarse alluvium gravel with D-75 size of 5 cm.

(a) 0.025 m

(b) 0.035 m

(c) 0.055 m

(d) 0.1 m

I had been asked this question in homework.

My enquiry is from Irrigation Channels Design in portion Sediment Transport and Irrigation Channels Design of Irrigation Engineering

1 Answer

0 votes
by (106k points)
Correct answer is (a) 0.025 m

Easy explanation: The strickler’s formula is n = d^1/6/24 where d = 0.05 m.

n = 0.05^1/6/24 = 0.025 m.

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