Flow is occurring in a rectangular channel

at a velocity of $0\mathrm{.}9$m$/$s and a depth of

$0\mathrm{.}3$m$.$ Neglecting the effect of velocity of

approach, determine the height of a

sharp$-$crested suppressed weir that must

be installed to raise the water depth

upstream of the weir to $1\mathrm{.}2$m$.$