An open channel with a rectangular cross$-$section is being used to move water from a pond to an irrigation storage reservoir. The channel has a width of $1\mathrm{.}06$ m and a depth of $0\mathrm{.}79$ m$.$ The minimum allowable freeboard in the channel is $0\mathrm{.}05$ m$.$

Calculate the channel's Hydraulic mean depth $($R$)$ in units of metres when the channel is flowing full, while still maintaining the channel's minimum allowable freeboard requirement. Provide your answer to two decimal places but do not include the unit in your answer.