There is hidden information here. He is multiplying by a percentage which doesn't make sense mathematically. What is going on or what I think is going on is that values he is using for horizontal distance is a hundred times the size. For example 5 is actually 5x10^2 . So if you convert the 2% into decimal .02 you can then (.02)(5x10^2) = 10 which is the same thing as (2%)(5) = 10.
I am wondering the same thing. In a previous video, he didn't assume the point fell exactly in the middle. On this example, we don't have enough information to use that strategy, so it essentially forces us to solve it assuming that PVI is in the middle.
I know this is an old comment. I am responding in case it helps others who are learning this now. The correct answer is 608.00 - (1)(5) = 603+00. This is because we know the exit grade is going down 2%, or -2%. The sign can be ignored as the equation is already taking into account the '-'. Here's a logic check to show you it's correct. If we were to use both negatives, making a positive sign in the equation, the answer would be 613+00 ft. This is saying that the EVC (or PVT) of the vertical curve is higher than PVI, which doesn't make sense.
Why did you say "608.00'-2(5)=608-10=598.00"??? It should't be like that! because g1 is going upward. Therefore you should put a + sign like so: [608.00'+2(5)=608-10=618.00] Thank you!
that would be incorrect seeing as 608 feet high was stated to be the highest point (Maximum) on the curve it's just the notation don't let it confuse you
Thanks2x I thought I would end up for nothing. my prof give us an assignment with lots of missing Given value and we need to find the elevation of BVC and EVC. just the given are g1 & g2, station and elevation of PVI, and "k" factors. thanks for this vids. It really helps, now I better understand how do I get the elevation of BVC and EVC. It comes with the same answer with what my prof teach..it is very cool since its much easier bcoz of the drawing than what my prof teach us and end up imagining for nothing >_
It is a dimension less number and slope value which say eg. for every 100ft in horizontal direction 1ft rise in vertical direction which can be represented as 1ft/100ft = 0.01 = 1% feet cancels out
The example given isnt really correct per real world application. Station 20+00 is 2,000 ft. You simply drop the plus sign, the plus sign is used in the construction industry to help annotate stationing for horizontal location......So, 2000 ft. minus 3000 ft is 1,000ft. That is the length of the vertical curve.
