The K-value is the length of vertical curve per one percent change of grade, so a larger K gives a longer, gentler curve.
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A K-value of 0 leaves the grade line kinked at that VIP, which is what LTDesignZ does everywhere.
Examples
(1)
Basic Examples
(1)
With no vertical curve the level at a VIP is the VIP's own level:
In[1]:=
LTDesignZCurved
[{{0,10.`},{100,20.`},{200,15.`}},{0,0,0},100]
Out[1]=
20.
The grade changes from +10% to -5% at that VIP, a change of 15%, so a K-value of 5 gives a 75 m vertical curve -- which lowers the crest by about 1.4 m: