Part II$.(80$ pts$)$ Perform the following calculations and analyses: $(1$B$)(5$ pts$)$ Is the current design optimum for the given side slope $(1$:$1(H$:$V))?$ Justify your

answer.

$(1$C$)(10$pts$)$ If you find the current design is not optimum, what dimensions are required to

have the optimum hydraulic design $($for the given side slope, $1$:$1(H$:$V))?$

$(25$ pts$)$ This problem has three parts $(1$A$,1$B$,$ and $1$C$)$

$1$A$.(10$ pts$)$ Calculate the uniform flowrate for an earth$-$lined $(n=0\mathrm{.}02)$ trapezoidal canal

flowing at a water depth of $4m.$ The canal is constructed on a slope of $0\mathrm{.}0001$ ; its bottom

width is $6m$ and side slope is $1$:$1(H$:$V).$