Question Statement for $27-32$: Water at $10C$ flows in a $3-$meter diameter circular channel half$-$full at an average velocity of $2\mathrm{.}5\frac{m}{s}.$

$27.$ What is the hydraulic radius $(m)?$

$($a$)0\mathrm{.}5$

$($b$)0\mathrm{.}75$

$($c$)1\mathrm{.}0$

$($d$)1\mathrm{.}25$

$($e$)1\mathrm{.}5$

$28.$ What is the Reynolds number?

$($a$)8\mathrm{.}0{10}^5$

$($b)9.0105

(c)0.5106

$($d$)1\mathrm{.}5{10}^6$

$($e$)2\mathrm{.}5{10}^{1}6$

$29.$ What is the hydraulic depth $(m)?$

$($a$)0\mathrm{.}75$

$($b$)1\mathrm{.}0$

$($c$)1\mathrm{.}178$

$($d$)1\mathrm{.}278$

$($e$)1\mathrm{.}5$

$30.$ What is the Froude number $($Fr$)?$

$($a$)0\mathrm{.}50$

$($b$)0\mathrm{.}75$

$($c$)1\mathrm{.}0$

$($d$)1\mathrm{.}25$

$($e$)1\mathrm{.}5$

$31.$ Is the flow critical or subcritical $($circle one$)?$

$($a$)$ critical

$($b$)$ subcritical

$32.$ If mannings $n=0\mathrm{.}013,$ what slope $(\%)$ is required to maintain the velocity of $2\mathrm{.}5\frac{m}{s}?$

$($a$)0\mathrm{.}10$

$($b$)0\mathrm{.}15$

$($c$)0\mathrm{.}25$

$($d$)0\mathrm{.}50$

$($e$)1\mathrm{.}0$