An equal$-$tangent sag vertical cureas an initial grade of$-2\mathrm{.}5\%$ It is known that the find grade is positive and that low point is at elevation $82\mathrm{.}3$m and sitation designed with PVC at station $3+320$ and elevation $290$ m$,$ the PVI at station $3+375$ and elevation $288\mathrm{.}74$ m$,$ and low point at station $3+365.$ Determine the design of the curve.