A $3-$m wide rectangular channel carries $20500\frac{L}{sec}$ of water at a $120-cm$ depth before entering a hydraulic jump. Compute the downstream water depth, $Y_2,$ and the critical depth, $Y_C.$

$Y_2=1\mathrm{.}28m$;$Y_c=1\mathrm{.}48m$

$Y_2=2\mathrm{.}38m$;$Y_c=1\mathrm{.}77m$

$Y_2=2\mathrm{.}33m$;$Y_c=1\mathrm{.}68m$

$Y_2=2\mathrm{.}28m$;$Y_c=1\mathrm{.}68m$