A $25$:$1$ scale module is being used to model a trapezoidal channel spillway from a reservoir. The actual channel base width is $60$ ft with side slopes of $2$:$1.$ If the flow velocity at $3$ ft depth is $1\mathrm{.}5$ ft$/$s$,$ what is the A$)$ prototype flow rate, B$)$ the model channel dimensions, C$)$ the model flow depth, velocity and flow rate $($Q $=$ VA$)?$ Froude similitude is used.