Problem $8\mathrm{.}2$: Flow rate in a trapezoidal channel is $12\frac{m^3}{s}.$ Channel is covered by concrete

and $n=0\mathrm{.}02.$ Bottom slope is $J_0=0\mathrm{.}003.$

d$)$ Same discharge flows in a circular concrete channel, how many channel are necessary.

e$)$ Find the regime for case $($a$)$ using general equation of critical flow. Calculate critical slope

and velocity.

f$)$ Find the regime for cases $($a$)$ and $($b$)$ using Fr number.

g$)$ Determine dimensions as hydraulically economic for case $($a$).$