About site grading and feature lines

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Civil 3d feature lines are used to define proposed features in our

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designs and can be used to create grading groups and surfaces.

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They can be considered to be like intelligent 3d poly lines.

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If I create a feature line from this polyline, that represents a pond,

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you can see that we have an option to assign it to a site.

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Feature lines can be created without a sigh

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and they will belong to this collection in prospector.

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Feature lines associated with the site will reside in the site folder.

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If I want to create grading from a feature line,

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it must belong to the same site as the grading group.

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The feature line style is important as we will see later.

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In this example,

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I'm going to assign levels for the feature line from the existing ground surface.

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We can easily edit the feature line elevations using the elevation editor

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in here. We can set the elevations of our points

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and use the editor as a calculator

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to set the grades along the segments of the lines.

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We can set the elevations of one or more points to a surface.

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And we can also make the feature line

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dynamic to the surface with a relative elevation.

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Using this option, if the surface elevations change,

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then the feature line will update

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feature lines in the same site will interact with each other

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where the lines cross, they must share a common elevation.

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Other objects in the same sight will also interact with each other.

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Alignments. Feature lines,

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grading groups and parcels

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can all belong to a site.

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We can demonstrate this by creating a new feature line and observing its behavior.

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I'm going to create a new feature line,

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assign it an elevation

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and put it in the same site as the pond.

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Notice how my new feature line has jumped to meet the edge of the pond

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in the elevation editor,

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we can see that additional points have been added

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to the line automatically where it crosses the pond.

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These elevations cannot be edited.

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The pond feature line also has additional points added.

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If I raise the pond feature line, notice how the other line adjusts dynamically,

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this behavior can be controlled by the feature line style.

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If I swap the styles of these two feature lines,

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you will see they swap in the hierarchy

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and the pond is now reacting to the second line.

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If we look at the properties of the feature line collection in the site,

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there are some options called split point resolution.

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This is where we can set the order of

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priority for the feature lines based on their style.

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In this drawing, we have created two styles, first priority and second priority.

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The first priority style is at the top of the list.

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So it will give its elevations to all other styles.

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I can move the second priority style beneath it.

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So we now have a set hierarchy for our feline crossings.

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We can use the feature lines to create grading objects or groups that

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will allow us to create rule based gradings that will be dynamic.

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Here we are creating the pond in the same site as the feature line.

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We can build up the grading using different criteria

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including grading back to a ground surface at defined slopes.

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If I move or edit the original feature line,

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the grading group will update

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now we're going to prepare a new model for our sight grading

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from the project folder, Iowa City 0601

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design models folder,

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open the site grading drawing.

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In this drawing,

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we have created some poly lines that we can use as the basis for our site grading.

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We will need to reference in the existing ground so

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that we can use it in our grading design.

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In prospector expand the surfaces collection under data shortcuts,

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select the existing ground surface, right click and select crate reference

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set the surface style to contours, 2 ft and 10 ft background

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and click. OK.

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Repeat this process to bring in the road top

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surfaces from each of the corridor models as shown

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set the style of these to contours 1 ft and 5 ft design.

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Finally from the corridor's collection,

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create a reference to the Sycamore Heights Corridor.

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When you reference a corridor,

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it will import all of the alignments and profiles it needs to build.

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We have now prepared our site grading model.