In a trapezoidal channel section, what is the condition to keep the depth of flow constant?

1
Z = 1 and θ = 45° 
2
\(Z =\sqrt{3} \) and θ = 90° 
3
Z =  \(1/\sqrt{3}\) and θ = 60° 
4
Z = 1 and θ = 30° 

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