Dam height-volume calculation

[Alas_1234]

Hi everyone,

I want to calculate volume for  between each height for dam reservoir.   My maximum water level is 345 m minumum level is 260 . I need volume for betwwen each surface:

volume for 260-261

                    261-262

                    262-263

                   344-345

How I find these values Is there any short method.?

Thanks for help!. I uploaded my civil 3d dwg.

[Jeew-m]

Hi,

Please check whether stage storage volumes suits with your case. I am not familiar with that, but have a feeling that could do it.

Thanks

[wfberry]

Would you not have to invert the dam to get stage storage to work? 

Just asking.

Bill

[Alas_1234]

Actually  there is not any relation with water or dam. I could ask simply like that how I can calculate volume between two surfaces?  ( there is almost 345-260=85 surfaces )

Note: As I understand u asked to change the direction of the axle. İf so, there is not important  direction.

[Alas_1234]

Still I couldnt solve

[wfberry]

If you notice I was responding to Jeew-M.  He was suggesting using stage-storage (used in detention basins) and well it might be the way since you have 85 surfaces but just imagine a pond to do this.  As I said earlier, it would be upside down but it would work.

Check out that method.   If you had developed the dam final surface, you may have received better info.

Bill

[Hisham_Fawzy]

hI @Alas_1234 

Try the: following

• make a surface for the ground data you have
• make a user-defined contour with the highest elevation you have
• extract this contour line from the surface and convert it to polyline with elevation 0
• adjust the area of the polyline to match your needs (for example untile the dam alignment)
• make sure that the polyline is closed 
• set the polyline as the outer boundary to the surface
• go to analyze tab -design-stage storage
• add the name for the report - click on define basin - define basin from surface contours.
• select your surface then you will find the table for each level volume and cumulative volume.
• add the table to the drawing then export it as.CSV 
• you will find some duplicate level but only one of them has the volume the others with areas only.

The report at the attachment is the volumes I got from your data. and the civil 3d file with 2018 version

[Hisham_Fawzy · Accepted solution]

@Alas_1234 

my previous solution was using the stage storage method. but I made it with another way and I got a completely different volume.

1. simply do the steps 1-6 (except change the polyline level to 345) then make a new surface and add the polyline to the new surface as break-line and outer boundary.
2. make a volume surface then check the volume it will be 20,559,347.09 Cu. M. 

The volume from the report was 15,667,479.14 Cu. M.  for average end area and 14,665,333.42 Cu. M.  for conic vol.

I think the problem came for the neglected areas in the report because the program took it an area only without volume. So I made some calculations at the report excel file ( sum the areas of each level ) then I used the average end area method the result was 19,275,665.4 Cu. M.

In the end, there is another solution to calculate the volumes

• follow the same steps in this reply by using the feature line instead of the polyline
• make the new surface and the volume surface is auto rebuild
• open the volume dashboard, add the volume surface to it,
•  write the current volume at excel file
• select the feature line and from the upper tab click raise or lower and set the value to -1 
• write the volume from the dashboard at each time you lower the feature line.
• After you get the volume for each level at the excel file, do the calculation to get the volume for each level (the volumes you wrote for each time you lower the level of the feature line was for the whole area until that level not the volume between every 2 levels).

I hope I did it clear enough for you.

[VTC_Solutions]

@Alas_1234 @wfberry @Jeew-m @Hisham_Fawzy You can use the third party app QuickVolumes to automatically obtain the cummulative volumes at different elevations, click on this link to the Autodesk App Store to learn more https://apps.autodesk.com/CIV3D/en/Detail/Index?id=3870259259361639432&appLang=en&os=Win64 

A demo of QuickVolumes is available in this link

https://www.vantecsolutions.com/product/quickvolumes/

The Civil 3D stage storage tends to be exact when the contour lines are concentric and the ground surface has a bathtub shape.

[Alas_1234]

 I will try all methods you suggested. Thank you all.

[neilyj666]

A simple volume surface (assuming a vertical face at the dam) and a volume table would be the quickest method?