Volume Dashboard Bounded areas not giving correct volume

[jgjDXYZW]

Hello

I'm fairly new to using the Volume Dashboard, as I've been using Stage Storage for calculation my ponds volumes previously. However I thought that Volume Dashboard might give a new and more dynamic way to see the Volume of my ponds in general (feel free to tell me otherwise or suggest other options). 

Usually I will have some rather simple ponds, where I have Feature Line as bottom and then Grade 1 m up as my Wet Volume and 1 more meter as my Detention Volume. Just to give an impression of the work flow. 

Then I open the Volume Dashboard, Create New volume surface (TIN Volume) and then I click add Bounded Area and click my 2-4 lines depending on the Pond. However when I often do that I don't get the correct volumes in the Volume Dashboard see attached pictures.  

Am I doing something wrong?

[Udo_Huebner]

Upload your sample file as a DWG. Maybe the stagestorage command does not give the expected result. Let's compare your calculations.

[jgjDXYZW]

@Udo_Huebner Just to clarify, the Stage Storage function actually works (define surface), but the Volume Dashboard doesn't. 

I've added the Workshop.dwg as an attachment, appreciate your help. 

[Udo_Huebner · Accepted solution]

Hej jgjDXYZW,

For me, both ways - STAGESTORAGE command and VOLUMNESDASHBOARD command - work as expected and give  the same results (7410 versus 7410m³). Your volume surface "surface2" is calculated between the existing ground and the basin - this is the volume you need to excavate to get the basin, but not the volume you can fill later.

Here is a short screencast: https://forums.autodesk.com/t5/civil-3d-forum/volume-dashboard-bounded-areas-not-giving-correct-volu...

You cannot use bounded Volumes, as your boundary using surface2 is not on the requested fill elevation.

[Udo_Huebner]

Here is the corrected link to the mentioned Screencast: https://autode.sk/38I4TaG