are some of the equations you mentioned that are not in the handbook in the CMA or greenbook or other reference? I know example 3 had used PVC elevation = PVI elevation - (g1*L/2) and I couldnt find that in the book. I would imagine it has to be in another usable reference manual for the exam?
The equations in this video are from the 2021 v1.0 Reference Handbook. Because the equation you referenced has been removed, I assume the intention is that we need to know this relationship and apply it during the exam. The equation is essentially telling us to find the elevation of the PVC by starting with the PVI elevation and subtracting the grade multiplied by the distance.
so for A ( algebraic difference in grades), and a (parabola constant), g1 and g2 are only numbers (no percent). For example, 4.2% upgrade, and -2.8% downgrade, when we using these grades to calculate A or a, they will be used as 4.2 and 2.8. However, when we are calculating PVC, we need to use4.2% and 2.8%?
As you know, the units are extremely important - it's possible to use feet & decimal percentage OR stations & percent grade. For instance, if you had a grade of +4% for 600 feet, these two alternatives would be: Feet and Decimal Percentage: 0.04 * 600 = 24 feet of elevation change OR Stations and Percent Grade: 4 * 6 = 24 feet of elevation change For simplicity and also for consistency with other vertical curve calculations, I recommend using stations and percent grade.
Thank you for the kind words! I have a set of playlists on related topics that might be helpful if you're looking for other similar videos: sites.google.com/ncsu.edu/daniel-findley/educational-resources
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Just what I needed. Broke down, rapid fire! Thanks so much.
Terrific, I'm glad it was helpful for you!
are some of the equations you mentioned that are not in the handbook in the CMA or greenbook or other reference? I know example 3 had used PVC elevation = PVI elevation - (g1*L/2) and I couldnt find that in the book. I would imagine it has to be in another usable reference manual for the exam?
The equations in this video are from the 2021 v1.0 Reference Handbook. Because the equation you referenced has been removed, I assume the intention is that we need to know this relationship and apply it during the exam. The equation is essentially telling us to find the elevation of the PVC by starting with the PVI elevation and subtracting the grade multiplied by the distance.
Thanks for explaining it very well.
Much appreciated! This cleared the topic up for me.
very good lesson. thank you much!
so for A ( algebraic difference in grades), and a (parabola constant), g1 and g2 are only numbers (no percent). For example, 4.2% upgrade, and -2.8% downgrade, when we using these grades to calculate A or a, they will be used as 4.2 and 2.8. However, when we are calculating PVC, we need to use4.2% and 2.8%?
As you know, the units are extremely important - it's possible to use feet & decimal percentage OR stations & percent grade. For instance, if you had a grade of +4% for 600 feet, these two alternatives would be:
Feet and Decimal Percentage: 0.04 * 600 = 24 feet of elevation change
OR
Stations and Percent Grade: 4 * 6 = 24 feet of elevation change
For simplicity and also for consistency with other vertical curve calculations, I recommend using stations and percent grade.
Great job! really informative session.
Thank you for the kind words! I have a set of playlists on related topics that might be helpful if you're looking for other similar videos: sites.google.com/ncsu.edu/daniel-findley/educational-resources
ncees hb 1.1, page 278.