Elevation Point Of Vertical Curve Formula

Equation for calculate elevation point of vertical curve is,

y = e_pvc + g₁x + [ (g₂ − g₁) ×x² / 2L ]

Where,
y - elevation of point of vertical tangency
e_pvc - Initial Elevation
g₁ - Initial grade
g₂ - Final grade
x/L - Length of the curve