PROBLEM $3(30$ points$)$:

LOCATION: An existing highway alignment parallels the Rio Grande de Loiza in a valley. The river's $500-$year flood elevation is at elevation $92\mathrm{.}50$ feet. The vertical alignment of the highway has a $3\%$ grade and intersects a $+2\%$ grade at station $75+00$ at elevation $75\mathrm{.}00$ feet. This road segment has a vertical curve $1,600$ feet in length.

REQUESTED:

A$)$ The length of the road that will be below the $500-$year flood level.

B$)$ The stations at both ends of the road section that will be submerged.

C$)$ A drawing with all the components of the road.