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Drainage profile - How to determine vertical scale?

Drainage profile - How to determine vertical scale?

Drainage profile - How to determine vertical scale?

I kinda feel stupid asking this question, but I can't get my head around it.
I just finished displaying a drainage pipe profile exaggerated 10 times on the vertical. No exaggeration on the Horizontal, so thats 1:1.
If my vertical is exaggerated 10 times, and I have a 20-scale border sheet around it. When I print full size, what would the vertical scale be? I need to indicate this on the print sheet.
I know the horizontal scale is 1"=20', but what would be the vertical scale?
Any help would be appreciated.


RE: Drainage profile - How to determine vertical scale?

The vert. scale would be 1" = 2', along with the horiz. scale of 1" = 20', that’s a ratio of 10/1.

RE: Drainage profile - How to determine vertical scale?

Thanks for the input. Trying to do the math on this, whats the rule of thumb?
I am guessing you take the border sheet scale and divide by the vertical exaggeration amount to get the scale. So in this scale 20-scale border sheet / 10-vertical exaggeration = 2 .

RE: Drainage profile - How to determine vertical scale?

There isn't a rule of thumb... There are some common scales, both metric and imperial. The selected scale should show what information you are trying to present, clearly. 1"=20' is not uncommon and a hor:vert scale 1:10 is also not uncommon... for flat prairie areas 1:100 has been used. No magic combination; use what you need, but, try for common.


RE: Drainage profile - How to determine vertical scale?

I don’t know exactly what a “border sheet” is, or what “a 20-scale border sheet around it.” really means. I suppose I have seen what you are talking about, but I’m not really understanding your terminology or what you are trying to do. I don’t know that there is some magic rule of thumb for this, but you can draw the two axes at any scale you want. Obviously, scales with nice round numbers are convenient 2, 5, 10, etc. You are changing these scales to be able to truly and fairly/honestly show the plotted variations. If you have a very flat profile with a max. variation of 1 or 2' in 100', you can hardly see those changes on a drawing/graph, so you exaggerate the vert. scale to show the relative changes at a glance, or to allow interpolation btwn. points. You said “my vertical is exaggerated 10 times,” and “the horizontal scale is 1"=20'.” So, my math was your 1" = 20' horiz. scale, or 20'/10 = 2', thus 1" = 2' on the vert. scale, that is, 1" on the vert. axis should equal one10th (.1) as much stuff as 1" represents on the horiz. scale. Maybe another way of saying it is that it takes 10" on the vert. axis to show the same amount of stuff as 1" does on the horiz. axis. An exaggeration of 5 times would be, 20'/5 = 4', thus 1" = 4' scale on the vert. axis. Maybe some good Surveying, Highway Design, or Engineering Graphics and Drawing text books would shed some light on this topic. Interestingly, you would do just the opposite scale jockeying if you were shooting elevations in the mountains and drawing the profile of a line.

RE: Drainage profile - How to determine vertical scale?

Or do it the old fashion way, put a scale on it and measure it. What scale it is plotted to is irrelevant when you measure it with a scale (as long as you know the size of a particular item, say for instance a pipe diameter).

RE: Drainage profile - How to determine vertical scale?

suggest that instead of getting wrapped up in the scales, use graphic bar scales. plans these days often are not plotted to the correct scale or plotted on paper at all. a graphic scale works at any plotting size.

RE: Drainage profile - How to determine vertical scale?

I don't put the 1 INCH=20' on my plans, just the graphic scale. That can lead to misunderstandings when printed off scale or half size.

RE: Drainage profile - How to determine vertical scale?

Thanks guys.

I guess my intent was to put a vertical scale on the sheet so that when printed, a reviewer can easily determine the vertical scale. The "border sheet" is reference to a boundary around the drawing that determines the scale of the drawing, say for a full size is 22" x 34" and its 20 scale on the horizontal. This is civil (Transportation) terminology.
I think @dhengr gets what I am trying to get at. Thanks for the explanation (@ dhengr )

RE: Drainage profile - How to determine vertical scale?

use graphic for both horizontal and vertical

RE: Drainage profile - How to determine vertical scale?

@ cvg, the graphic scale works great. I will include it in the drawing.

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