Question

#Question 2

What is the hydraulic radius of a stable canal carrying a discharge of 27m³/s using Lacey's method ?
(Assume silt factor is 1·0)

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Answer 1

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Solution: A = 120/2 = 60 m2

R =

= 2.77 m

P = 60/2.77 = 21.66 m

Now BD +

= A

BD + 1.785

Now B + 2D (

B + 3.57 D = 21.66

Solving above two equations, we get D = 4.28 m and B = 6.38 m.

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