Great question - I multiplied the distance (663 feet) by the longitudinal grade (-2.32%) which equals -15.3816 feet. So, there is a drop in elevation of 15.3816 feet between those points.
For a symmetrical, parabolic curve (our assumption for vertical curves), the PVI is halfway between the PVC and PVT. Therefore, the 700 feet long curve has 350 feet between the PVC and PVI, as well as, between the PVI and PVT. The station of the PVI is the PVC (34+80) plus 350 feet, which is equal to 38+30.
Hello, Sir, I hope you're doing well, I have a question regarding vertical alignment. How to design vertical alignment considering grades and cut fill at the same, how to set grade ruling and limiting on NGL.
Mohammad, great question - it's an iterative process to coordinate horizontal and vertical alignment, along with balancing cut & fill. While considering the maximum grade, it can be helpful to lay out some initial grades that roughly balance the cut and fill. Here are some additional videos on vertical alignment in a youtube playlist: ua-cam.com/play/PLQ2tBMRKXROZsDv_W9Ax-ytgp5x3y2BQX.html
![Reading Design Plans - Vertical Curve Elements [Parabolic Equation and Low Point Station/Elevation]](http://i.ytimg.com/vi/m0ExqfREesU/mqdefault.jpg)
![Reading Design Plans - Vertical Curve Elements [Parabolic Equation and Low Point Station/Elevation]](/img/tr.png)
Great problem and solution! Easy to follow. Thank you, Karen
You're welcome - I appreciate the kind words!
I have a question how did you get the change of elevation? 5:02
Great question - I multiplied the distance (663 feet) by the longitudinal grade (-2.32%) which equals -15.3816 feet. So, there is a drop in elevation of 15.3816 feet between those points.
how are you getting that 38+30
at 4:08 mininutes
For a symmetrical, parabolic curve (our assumption for vertical curves), the PVI is halfway between the PVC and PVT. Therefore, the 700 feet long curve has 350 feet between the PVC and PVI, as well as, between the PVI and PVT. The station of the PVI is the PVC (34+80) plus 350 feet, which is equal to 38+30.
thank you sir
Thank you so much🙏
Hello, Sir, I hope you're doing well, I have a question regarding vertical alignment. How to design vertical alignment considering grades and cut fill at the same, how to set grade ruling and limiting on NGL.
Mohammad, great question - it's an iterative process to coordinate horizontal and vertical alignment, along with balancing cut & fill. While considering the maximum grade, it can be helpful to lay out some initial grades that roughly balance the cut and fill. Here are some additional videos on vertical alignment in a youtube playlist: ua-cam.com/play/PLQ2tBMRKXROZsDv_W9Ax-ytgp5x3y2BQX.html
@@FindleyDaniel Thank you.