$4\mathrm{.}5$ In a very long, wide rectangular channel the discharge intensity is $3\mathrm{.}0\frac{m^3}{s}\frac{?}{m}$ width. The bed slope of the channel is $0\mathrm{.}004$ and Manning's $n=0\mathrm{.}015.$ At a certain section in this channel, the depth of flow is observed to be $0\mathrm{.}90$ m $.$ What type of GVF profile occurs in the neighbourhood of this section?