Question

A vertical parabolic sag curve of Lapulapu underpass has grade of -4% followed by a grade of +2% intersecting at station 12+150.80 at elevation 124.80 m. above sea level. The change of grade of the sag curve is restricted to 6%.

- Compute the length of curve.
- Compute the elevation of the lowest point of the curve.
- Compute the elevation at station 12+125.60

Answer #1

vertical parabolic sag

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