Question $3$

a$)$ Explain two types of flows that are possible in a channel carrying constant flow with

the help of specific energy diagram Also, comment on the flow condition in the channel

when specific energy is minimum.

$(5$ marks$)$

b$)$ A channel with a rectangular cross section with $7\mathrm{.}5$m wide, is discharging water at

a rate of $12$ m$3$

$/$s with an average velocity of $1\mathrm{.}5$ m$/$s$.$

$($i$)$ Calculate the specific energy head of flowing water $(4$ marks$)$

$($ii$)$ Calculate the depth of water when specific energy is minimum $(4$ marks$)$

$($iii$)$ Calculate the velocity of water when specific energy is minimum $(4$ marks$)$

$($iv$)$ Find the minimum specific energy head of flowing water $(4$ marks$)$

$($v$)$ Identify the type of flow in this channel with justification $(4$ marks$)$

$($Total Mark $25)$