A $7\mathrm{.}2$ m height and $15$ m long spillway discharge $94$ m$3/$s$,$ under a head of $2\mathrm{.}0$m$.$ If a $1$:$9$ scale model of this spillway is to be constructed, determine model dimensions, head over spillway model and the model discharge. If model experience a force of $7500$ N $(764\mathrm{.}53$ Kgf$),$ determine force on the prototype.