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Is there a way to generate an area volume report along a HAL between an Existing Surface Model and a Subgade surface at a specified interval such as an in-roads "end area volume report".

I am trying to take a Finished design model that I have created a subgrade surface for, and compute a volume report at 5ft intervals that I can compare to the "End Area Volume Report" provided for my project by the Department of Transportation. I am trying to determine the cut and fill volumes between the existing surface and subgrade surface.

I have attached what the DOT has provided. 

Any insight would be appreciated.

Hi Jason

What you need to do is to create a corridor using the surface instruction.

To do this first off you need an alignment to run the corridor along, so step one create the alignment if you don’t already have one.

Step two is to create a corridor where you choose your alignment and existing ground model to do your calculations on. Don’t forget to reference in your two surfaces by checking the boxes to use as reference models in your corridor, click ok.

Now the corridor template editor should have opened, what you need to do is create a new instruction, choose “Surface” instruction and choose your existing ground model.

Insert another instruction that should also be the “surface” instruction but this time choose your subgrade surface. By now you should get cut and fill values as you scroll through the corridor.

Last step is to run the corridor earthwork report and here you can set your 5ft interval and also beginning and end stations if you’d like.

Hope this helps you out mate.

Joseph, thank you for the help. This worked to a point however, I am back to being stuck on a different issue. Is there a way to edit a cross section that was calculated this way? It seems like the cross section generated has areas that will not recognize a cut to sub grade level.

Please excuse my terrible use of paint.

Green area is existing ground, the blue is the cut down to sub grade. The red line is the alignment and for some reason it will not tie back into the FG. Any ideas as to what this issue is? 

thank you!

Hello Jason

There are numerous ways to go about this but easiest is if you could share the project(vce file) either here or by mail for me to have a look at but from your screenshots it seems you have some “spikes” coming up on the left side/underneath the alignment so the subgrade surface might need some cleaning and in the corridor you will have to add an instruction to close the area where you have drawn the red arrow.

Normally when you get areas that dont compute it is because the two surfaces dont create a "Closed Area" between them. The easiest way to fix that is to add a Side Slope to the two end points of the Subgrade Surface Instruction that ties to the Existing Ground surface. You can use "Up" as the Cut Slope and "Down" as the Fill Slope for Vertical Slopes - this will create closed areas and will compute the numbers for you.

Note each Surface Instruction you add will create 2 nodes in the Node List for a Corridor template - one for each end of the Surface model that is being added. You just use those as the reference nodes for the Side Slope elements that you add.

The existing Surface should be added to the Corridor Model as Original Ground, and you need only one surface instruction in the Corridor Template. If you had eg Finished Grade and Subgrade, you can either

1) Add one of the surfaces as Existing Ground and the other as a Surface Instruction - that way you dont need to add an Existing Ground to create your Corridor Earthworks report

2) If you add Finished Grade as "Finish" and Subgrade as "Subgrade" Material Layers in the Template Editor, then you will also need an Existing Ground in order to compute any Corridor Earthwork Volumes - you can fake that with a Rectangle at an Elevation close to Design Elevation and just ignore the Cut / Fill numbers as they are irrelevant. The easiest is to use (1) above though.

If you need to limit the width of a surface instruction, uou can limit the lateral extents of a surface instruction to eg -50 and +50 offsets to the Centerline as needed.

If the width of the surfaces needed is greater than the total width displayed, then you need to edit the properties of the Template to make the Left and Right Offset Limits larger (Click the surface in the Template Editor and go to properties)

Hope that this helps

Alan