For an economical trapezoid,$b=2y(\sqrt{1+z^2}-z)$ and R=y/2=.20 m. With z=1,y=.4,b=.331371 m and area=y(b+zy)=.292548 m². Manning gives $Q=100(.292548)(.2)^{2/3}(.0004)^{1/2}=\mathbf{.20}$ m³/s after rounding.
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