Question: b . Show that a trapezoidal section with a given area, ( A ) , and side slope ( Z: 1

b. Show that a trapezoidal section with a given area, \( A \), and side slope \( Z: 1\) is most efficient when the hydraulic radius, \( R \), is half the depth of flow, \( y \).
[12 marks]
b . Show that a trapezoidal section with a given

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