$($B$)$ Plot accurately specific energy diagram for a rectangular channel having Discharge as $15\frac{m^3}{sec}$ and bottom width as $4m.$ From the graph, find the following;

$($i$)$ Critical depth and minimum specific energy

$($ii$)$ Specific energy at a water depth of $3\mathrm{.}5m.$

$($iii$)$ Alternate depths $($two depths$)$ at a specific energy of $4m,$ and classify them.

$\backslash$table$[[Y(m),,,],[0\mathrm{.}25,,,],[0\mathrm{.}5,,,],[1\mathrm{.}0,,,],[1\mathrm{.}5,,,],[2,,,],[2\mathrm{.}5,,,],[3,,,],[3\mathrm{.}5,,,],[4,,,],[5,,,]]$

$6$