QUESTION SIX

a$.$ Explain the following

i$.$ Causes of varied or non$-$uniform flow in an open channel

$[4$ marks$]$

ii$.$ Difference between rapidly varied flow and gradually varied flow

$[4$ marks$]$

b$.$ Water flows uniformly in a rectangular channel with finished$-$concrete surfaces. The channel width is $3$ m $,$ the flow depth is $1\mathrm{.}2$ m $,$ and the flow rate is $v^{}=10\mathrm{.}2\frac{m^3}{s}.$ compute the following

i$.$ Cross section of the open section flow

$[2$ marks$]$

ii$.$ The perimeter of the open channel flow

$[3$ marks$]$

iii. The hydraulic radius

$[3$ marks$]$

iv$.$ Critical depth for this flow

$[4$ marks$]$

TOTAL: $[20$ MARKS$]$