AutoCAD Civil 3D

[#1]

Hello All,
I am new to Civil3D And I am using it for one purpose,
Im working at producing planning drawings for solar farms, and the client has asked to me produce topographical surveys highlighting where the gradient or the slope is greater than 15 degrees

Is there someway i can use Civil 3d to do this?

Ideally im looking at producing a 3D Model which has shaded areas for the areas which are above 15 degrees
And Hopefully another shaded for areas between 15 and 10 degrees, 10 and 5 and 5 and 0

The topographical surveys i am downloading at the moment are from a site called promap and are DSM Type?
Thanks for reading this message and please excuse my ignorance on the Subject

[#2]

STEP 1: start new drawing with a out of the box NCS template

STEP 2: create your surface (or import into this drawing)

STEP 3: surface properties>analysis tab > run a slope analysis for desired intervals, set colors as necessary.

STEP 4: assign SLOPE BANDING style to your surface to see the slope colors

[#3]

Thanks for the Reply, I have created the surface from a 3D Polyline Survey,
(although it did come up with many error messages during creation)
I have completed the slope analysis and it has filled all the slopes as one colour, 
How do i go about applying the "Slope Banding" 
Thanks again for your help

[#4]

This is the Error Messages i am getting when trying to make a surface

[#5]

Right click on the surface, go to properties, then assign a slopes style to the surface. If you started with a NCS template, I think there is a surface style called slope banding 2D. Assign this style to your surface.

As for the errors, you have lines crossing that you are using to create your surface. You can either zoom to and resolve them, or set "allow crossing  breaklines" under your surface properties definition tab.

[#6]

I think I'd look at all these crossing breakline errors to see why they are occuring (typically 3D poly lines crossing each other with no common point at the intersection). The elevation different may be very small ( several mm in metric) or larger (10's or 100's of mm) but either way the integrity of you surface will be questionable.

Depending on the end use (planning drawing and slope analysis in this case) the surface integrity may not be an issue but it may become an issue further down the line 

[#7]

The lines are not crossing in anyway as far as i can tell, 
Still coming up with these Errors, The Topo Survey i am working on is a DSM RADAR Contour drawing as Attached,
Also whenever is run the Analysis my computer seems to be Crashing, Im running 
A Quad Core 3Ghz Processer with 4 Gig of Ram
Internal Graphics card with 1632mb of memory
(I Gather this may not be Enough)

Thanks for all your help, 
3rd Day in the Job and the Boss is shouting at me to get this done lol

[#8]

i do not have access to Civil 3D at the moment, so I hope someone else can take a look at your file and help you out! if its crashing while running the slope analysis, you may want to limit your analysis only to the area of concern. to do that, add a surface outer border (non-destructive) and then re-run the slope analysis on the smaller surface.

[#9]

If the breaklines look OK try editing the command settings to allow crossing breaklines.

The crashing:

"A Quad Core 3Ghz Processor with 4 Gig of Ram Internal Graphics card with 1632mb of memory (I Gather this may not be Enough)"

You gather correctly! Processor is good (it's the speed that counts) but RAM is way low and you need at least a mid-range graphics card with a Gig or 2 on it. 8 GB of system RAM is minimal, 12 GB or better is more like it.

[#10]

Looks like I was wrong about the end points. At least Help says they don't count. Or maybe that the setting doesn't help those cases.

From Help-

"This setting does not apply to breakline intersections that occur at the endpoints of breaklines"