Stations are written as the number of hundreds + remaining. Ex: The first station is 1+00 and
Question:
Stations are written as the number of hundreds + remaining. Ex: The first station is 1+00 and the second station would be written as 2+00.
If you are 11+ 62.5 stations from the start of a project, you are 1162.5 feet from the start of the project.
Slope: rise/run (use feet for horizontal distance)
Grade: rise/rum * 100% (use stations for horizontal distance)
3% grade means for every 100 feet horizontal, the rise in the road is 3 feet vertically
3% = .03, but using stations would be reported at a grade of 3
Civil Engineers at NCDOT measure using stations instead of feet. From Crests and Sags part 1, you determined that the curve elevation function for the 400-foot vertical curve (horizontal width) with a beginning grade of
-5.1% and ending grade is 2.4% is y = 0.00009375x^2- 0.051x + 114.97 where x is in horizontal feet.
1- Use the formula a= (G2-G1)/ 2L , to determine value of a in stations.
2- Rewrite the equation Y = 0.00009375X^2 - 0.051X+114.97 where x is in stations.
3- Rewrite the following horizontal distances in feet to stations. Then use the stations and the equation you found from #2, to determine the elevations of the curve.
Horizontal Feet | Stations | Vertical Elevation |
0 feet | ||
50 feet | ||
100 feet | ||
150 feet | ||
175 feet | ||
200 feet | ||
225 feet | ||
250 feet | ||
300 feet | ||
350 feet | ||
400 feet |
4- Suppose in this scenario the stormwater drop is placed 1.4 stations from the VPC.
a.Explain why this is not optimal placement for the stormwater drop.
b. Where should the stormwater drop be placed for optimal roadway drainage? Determine the elevation for the appropriate storm drain placement.
5- During a hurricane event, the model predicts stormwater will rise to an elevation of 109.00 feet. Determine the interval, in stations, in which the roadway floods.
6- Why do you think the roadway will still flood even though the drain is at its optimal location for roadway drainage? What other factors may be contributing to the flooding issues?
Expert Answer:
1 To determine the value of a in stations we need to convert the grades and the curve length from percentage and feet to stations One station is 100 feet so the curve length L is 4 stations The grades ... View the full answer
