Flow area is $A=Q/v=2$ m². With b=2y,$2y^2=2$,so y=1 m and b=2 m. Wetted perimeter is 4 m, giving hydraulic radius.5 m. Manning velocity gives $S=[vn/R^{2/3}]^2=[.02/.5^{2/3}]^2=.00100794$. Multiply by 100 to obtain **0.10%**.
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