A flat$-$bottom trough $400$ m long and filled with water to a depth of $0\mathrm{.}3$ m has a freeboard $($clearance above the still water line$)$ of $0\mathrm{.}05$ m$.$ What is the maximum wind speed along the trough axis that can occur without water spilling out of the trough at the downwind end? Neglect wind Waves