(Solution) - Suppose that the side angles -(2025 Original AI-Free Solution)

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Suppose that the side angles of the trapezoidal channel in Prob. 10.39 are reduced to 15° to avoid earth slides. If the bottom flat width is 8 ft,
(a) Determine the normal depth and
(b) Compare the resulting wetted perimeter with the solution P = 24.1 ft from Prob. 10.39. (Do not reveal this answer to friends still struggling with
Prob. 10.39.)