The approximate location of the low point of a 400 ft sag vertical curve is at which of the following stations? Assume g₁ = -3.2%, g₂ = 1.8%, PVI is located at Sta 100+00.

Question

Quizplus · Accepted Answer

The station of the low point is approximately 100+56. Solution: Use the sag vertical curve formula X = -g₁ / r = -g₁ L / (g₂ - g₁ ) Where L = 400.00 ft = 4 Sta g₁ = -3.2 g₂ = 1.8 X = - (-3.2)(4) / (1.8)-(-3.2) = 2.56 Sta Low point location is 256 feet from beginning of the vertical curve = [(100+00.00)-(2+00.00)] + (2+56.00) = 100+56.00

The Approximate Location of the Low Point of a 400