A vertical curve has g1 = -3% and g2 = +6 for a vertical curve length of 1200 ft. What is the elevation at the low point if the low point is 400 ft from the PVC? PVC elevation is 53.50 ft. a. 59.50 ft b. 47.50 ft c. 53.50 ft d. 50.00 ft
Question
A vertical curve has g1 = -3% and g2 = +6 for a vertical curve length of 1200 ft. What is the elevation at the low point if the low point is 400 ft from the PVC? PVC elevation is 53.50 ft. a. 59.50 ft b. 47.50 ft c. 53.50 ft d. 50.00 ft
Solution
To solve this problem, we need to use the formula for the elevation at any point on a vertical curve:
E = E_PVC + g1*x + (g2 - g1)x^2 / (2L)
where: E_PVC = elevation at the point of vertical curvature (PVC) g1 = initial grade g2 = final grade x = distance from the PVC L = length of the curve
Given: E_PVC = 53.50 ft g1 = -3% = -0.03 (converted from percentage to decimal) g2 = +6% = 0.06 (converted from percentage to decimal) x = 400 ft L = 1200 ft
Substituting these values into the formula:
E = 53.50 + (-0.03)*400 + (0.06 - -0.03)400^2 / (21200) E = 53.50 - 12 + (0.09)*160000 / 2400 E = 41.50 + 60 E = 101.50 ft
However, this answer is not in the provided options. There might be a mistake in the problem or the provided options.
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