Through a channel of indefinite length and rectangular section shown in the figure, a flow of $15\frac{m^3}{s}$ circulates. The normal draft for width B$-5m$ is $Y=1\mathrm{.}42m$ and the associated specific energy Eo$-1\mathrm{.}65$ m$.$ The critical draft for B$-5$ m is Ycs $=0\mathrm{.}97m$ and for $b=3m$ is $Y0=1\mathrm{.}37m.$ What happens in the section with width $b=3m?$ How does the section with width $b=3m$ act? What happens downstream of said section?

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draw the backwater curves, the energy curves and their drafts Normal Critical etc. Use as Help The photo that tries to reach the solution but cannot