Compute and plot the specific energy for a triangular $(z=3)$ cross section for a discharge of $3\frac{m^3}{s}.$

Use $=1$ and a $y$ of $0\mathrm{.}02m.$ Plot $y$ and $E$ in the range of $0\mathrm{.}5$ to $1\mathrm{.}2m.$

a$)$ Determine $y$ critical from your plot and compare it with the equation in Table $5\mathrm{.}5\mathrm{.}2-1$

b$)$ If the channel slope is $0\mathrm{.}01,$ determine channel roughness that cause flow to have a specific

energy of $0\mathrm{.}98m$ under i$)$ subcritical and ii$)$ supercritical flow.

What type of bed materials are related to each condition?