$($a$)$ Explain the wet perimeter and hydraulic radius for the drainage of water tank as shown in Figure B$1($a$).$

Terangkan perimeter basah dan jejari hidraulik bagi saliran tangki air seperti yang ditunjukkan dalam Rajah BI $($a$).$

Figure Bl$($a$)/$ Rajah B$1($a$)$

$[4$ marks$]$

$[4$ markah$]$

$($b$)$ Water is transported in a rectangular channel cast iron has a bottom width of $10\mathrm{.}0$ m at a velocity $\backslash (3\mathrm{.}0\backslash$mathrm$\{$~m$\}/\backslash$mathrm$\{$s$\}\backslash ).$ The terrain of the bottom channel drops $\backslash (1\mathrm{.}5$: $1000\backslash )$ Iength. Determine the minimum height of the channel under uniform$-$flow condition. Given $\backslash ($ n$=0\mathrm{.}013\backslash ).$

Air dialirkan melalui saluran besi berbentuk segiempat yang mempunyai lebar dasar $10$ m pada halaju $\backslash (3\backslash$mathrm$\{$~m$\}/\backslash$mathrm$\{$s$\}\backslash ).$ Bentuk muka bumi pada bahagian dasar saluran turun $1\mathrm{.}5$:$1000$ panjang. Tentukan ketinggian minimum saluran tersebut di bawah keadaan aliran seragam. Diberi $\backslash ($ n$=0\mathrm{.}013\backslash ).$

$[9$ marks$]$

$[9$ markah$]$

$($c$)$ A trapezoidal channel with a bottom width of $0\mathrm{.}8$ m $,$ trapezoidal angle of $\backslash (50^\{\backslash$circ$\}\backslash ),$ built on a bottom slope of $0\mathrm{.}007$ as shown in Figure B$1($c$).$ If the flow depth is $0\mathrm{.}52$ m and $\backslash ($ n$=0\mathrm{.}016\backslash ),$ determine the flow rate of water through the channel.

Satu saluran trapezoid dengan kelebaran $0\mathrm{.}8$ m $,$ sudut sisi trapezoid $\backslash (50^\{\backslash$circ$\}\backslash ),$ dibina di atas kecerunan dasar adalah $0\mathrm{.}007$ seperti ditunjukkan dalam Rajah B$1($c$).$ Jika kedalaman aliran ialah $0\mathrm{.}52$ m dan $\backslash ($ n$=0\mathrm{.}016\backslash ),$ tentukan kadar alir air yang melalui saltrran tersebut.