A rectangular canal $2\mathrm{.}24m$ wide and $1\mathrm{.}12m$ deep has a full capacity of $8\frac{m^3}{s}.$ Assuming $n=0\mathrm{.}0152$ what is the slope of

the channel bed?

$0\mathrm{.}00509$

$0\mathrm{.}00081$

$0\mathrm{.}00283$

$0\mathrm{.}00182$

A rectangular planned timber flume is to carry $3\mathrm{.}01\frac{m^3}{s},$ with a velocity of $1\mathrm{.}78\frac{m}{s},$ slope of flume is $0\mathrm{.}000155.$ What

should be the width of most efficient rectangular section to be used?

$1\mathrm{.}84m$

$1\mathrm{.}79m$

$1\mathrm{.}50m$

$1\mathrm{.}22m$