Help with this fluid mechanics problems step by step to learn how to resolve others. $.$ A circular, unfinished concrete drainpipe is laid on a slope of $0\mathrm{.}0025$ and is planned to carry

from $50$ to $300f\frac{t^3}{s}$ of run$-$off water. Design constraints are that $(1)$ the water depth should be

no more than $\frac{3}{4}$ of the diameter; and $(2)$ the flow should always be subcritical. What is the

appropriate pipe diameter to satisfy these requirements? Note: For unfinished concrete $$~~

$0\mathrm{.}014$ and the angle is $=120.$ the maximum flow is $300f\frac{t^3}{s}.$ Make sure to use

$=1\mathrm{.}486$ for BG unit.

The painted$-$steel channel of Figure below is designed, without the barrier, for a flow rate of $6$

$\frac{m^3}{s}$ at a normal depth of $1$ m $.$ Determine $($a$)$ the design slope of the channel. Assume, $n=$

$0\mathrm{.}014$ for painted steel.