$($SECTION $3\mathrm{.}5)$

$3\mathrm{.}5\mathrm{.}1.$ Water at $4C$ flows at the rate of $3\mathrm{.}5cms(\frac{m^3}{s})$ through a corrugated metal pipe $($CMP$).$ If the diameter of the pipe is $2\mathrm{.}25m,$ determine the friction factor and flow type $($i$.$e$.,$ laminar, critical zone, turbulent $-$ transitional zone, turbulent $-$ smooth pipe, or turbulent $-$ rough nine$)$