Water approaches a rectangular weir through a channel $2\mathrm{.}00$ m wide and in which the depth of flow is $0\mathrm{.}57$ m$.$ The weir has a crest length of $0\mathrm{.}90$ m located centrally in the channel. The crest is set at a height of $0\mathrm{.}30$ m above the bed. The CD is $0\mathrm{.}61$ and the head over the crest is $0\mathrm{.}27$ m$.$ Ignoring the side contractions and without considering the velocity of approach, the discharge is:

Question $6$ options:

$0\mathrm{.}227$ m$3/$s

$2\mathrm{.}682$ m$3/$s

$1\mathrm{.}321$ m$3/$s

$3\mathrm{.}144$ m$3/$s