Vertical Curve Formulas
VERTICAL CURVE FORMULAS
L | = Length of Curve | g2 | = Grade of Forward Tangent | |
PVC | = Point of Vertical Curvature | a | = Parabola Constant | |
PVI | = Point of Vertical Intersection | y | = Tangent Offset | |
PVT | = Point of Vertical Tangency | E | = Tangent Offset at PVI | |
g1 | = Grade of Back Tangent | r | = Rate of Change of Grade |
y = ax2 | a = | g2 - g1 | ||
2 L |
E = a (L/2)2
r = | g2 - g1 | |
L |
Tangent Elevation = YPVC + g1x
Grade Elevation = YPVC + g1x + ax2
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