K Value in a VERTICAL CURVE

[Chasethewind-di]

Example:

G1 = 2.5%
G2 = 1.5%
Length (L) = 100 Ft. or whatever.

So it will be a CREST Vertical Curve.

1. How do we calculate the Algabraic(A)Difference in grades? Is it just 1.0%? And what is a algabraic difference? Can there be a negative Algabraic Difference.

2. K = L/A Is this the Correct Formula?

Thanks.

[TKHunny]

You questions may be answered by a search of the internet. I went to Altavista and entered the following as search criteria:

K-Value Vertical Curve

Clicking the "Find" button produced 722 hits.

The third one (or maybe the second, depending on how one counts hits) seemed particularly interesting. I repeat it's link here for your convenience:

http://kepler.covenant.edu/~swanson/pdf/verticalcurve.pdf

[Chasethewind-di]

FYI Everyone

Example

G1 = -1%
G2 = 3%

So the algebraic difference = 4%

The formula is also correct.

Remember you NEVER can have a negative algebraic difference.

Thanks anyways Peeps.

Found it in an old surveying book.