stage-storage table with same multiple rows

[ms_khajeali]

When I generate a stage-storage table for a designed pond, I get multiple rows with the same elevation. Civil 3D only uses the first row at each elevation to calculate the volume, ignoring the others. This causes the total volume to be underestimated. How can I resolve this issue?

[Pointdump]

Hi Marzieh,
Welcome to the Autodesk Forums.
Can you post your drawing and a screen shot or two illustrating the problem?
Dave

[ecfernandez]

Hi @ms_khajeali, the stage storage contour elevation rows of the analysis are defined based on the contour intervals provided either manually or by selecting the pond surface. Take a look at the following images:

This is the stage storage analysis for a pond surface with 1-5m contour interval, this is minor contours every 1m, and major every 5m

This is the stage storage analysis for a pond surface with 2-25m contour interval, this is minor contours every 5m, and major every 25m

As you could see, the pond surface is the same, but the elevation interval for the analysis changed based on the contour interval.

Now the question would be, which option did you selected to define your basin? from entity, or "manual contour data entry (see images)

Which option did you choose?

Manual contour data entry

Depending on this, you should do either of the following to solve your issue:

a. If selected the "Define Basin from entity" then just go ahead and change the contour interval of your pond surface or create a new surface style with the desired contour interval. Then, assign it to your surface. The Stage storage analysis will use any contour interval you assigned to your surface.

b. If selected "Use Manual Contour Data Entry" (which I think you did not) then, go ahead an input the data for the intervals as desired.

The last thing to review would be the user defined contours. Open the properties of your pond surface and go here to see if you have any: 

Note that the software will use any User defined contour you have in your surface in the analysis (this might be the reason why you have repeated interval as you mentioned. Civil 3D does not create repeated contours).

Take a look at the following, it is the same surface I showed you before in this post, but this time it has a user defined contour at 13m elevation. Even though we cannot see it (because it is turned off in my surface style) the stage storage analysis will include it in the analysis.

I hope this information helps you figure out what's going on.

If you can, as @Pointdump suggested, could you please upload your file so we can take a look at it? It would help us provide tailored feedback.

Best regards, 

[fcernst]

You must have some islands.. you need to take it Excel, add them up, and do your stage-storage computation there in Excel. Can’t do it in civil 3D. 

just make sure you’re not including contours outside of the depression contours on the outside embankment..