The ordinates, $u$, of a $2$-hour unit hydrograph (i.e., for $1$ cm of effective rain), for a catchment, are shown in the table.
$$\begin{array}{|c|c|c|c|c|c|c|c|c|c|c|c|c|c|} \hline t\ \text{(hour)} & 0 & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 & 10 & 11 & 12 \\ \hline u \:( m^3/s) & 0 & 2 & 8 & 18 & 32 & 45 & 30 & 19 & 12 & 7 & 3 & 1 & 0 \\ \hline \end{array}$$
A $6$-hour storm occurs over the catchment such that the effective rainfall intensity is $1$ cm/hour for the first two hours, zero for the next two hours, and $0.5$ cm/ hour for the last two hours. If the base flow is constant at $5 \: m^3/s$, the peak flow due to this storm (in $m^3/s$, round off to $1$ decimal place) will be __________