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STAGE STORAGE EXTENSION CALCULATION ERROR - CIVIL 3D 2010
STAGE STORAGE EXTENSION CALCULATION ERROR - CIVIL 3D 2010
I have created an irregular shaped pond and wish to check the as-built volume of this pond. When I run the stage storage extension I get a volume which is 26,000 cubic metres less than when I manually calculate volumes!!
I am using a tin surface to generate pond volumes.
I have had a colleague create a separate surface model (in another software package) and then carry out an independant check of volumes. His calculations were within 500 cubic metres of my manual calcs.
Does anyone have any information concerning the accuracy of the stage storage extension in 2010?
Thanks for getting in touch. I have attached a copy of the drawing. You will see that I have trimmed the surface back to the edge of the pond to eliminate any additional parts of the greater surface adversely affecting the stage storage calculations.
I have also attached a table from my colleague (XLS file) which shows his calculations. The linework in this drawing is his - I have created the surface and stage storage tables only. Due to file size limitations I willsend SSE table in separate table/email.
Attached is a copy of the table from the SSE function in CIVIL 3D. I inserted the table into the drawing and then exported to a CSV file.
When I look at my contour areas between Elevations 374.5 and 379.5 they are pretty much in agreement with those of my colleagues - see attched xls file. The problem seems to be with the volume calc. eg; compare volumes at 379.5m on xls file and SSE table - they differ by about 26,000 cubic metres at that elevation.
Unfortunately, your situation isn't unique, but the problem occurs in that the tool doesn't handle multiple areas at the same elevation adequately or properly. You should notice that there are areas (large ones in fact) that don't add to the volume of your pond.
Please open a Support ticket. Your work around is to take the exported areas, sum those indivual disconnected areas, and prepare a table as you did.
Matthew Anderson, PE CFM Product Manager Autodesk (Innovyze)
I have the same problem with the Stage Storage Extension. I have an existing pond surface with multiple contour intervals of the same elevations in some spots. The calculations from the stage storage extension is totally off compared to just making a rectangular surface at a specified water elevation and then using the Volumes tool.
Is this problem fixed in Civil 3D 2011 ? Is there a way to fix this in 2010 ?
I opened a support request about six weeks ago. I did recieve an email saying that they had recieved my request and that it would be dealt with directly - since then ........nothing. I am still waiting on some action or at least maybe someone can tell me what the plan is; will there be a hot fix? do we have to wait until the next release?
Unfortunately, the Stage-Storage tool isn't geared for multiple contour areas at the same elevation, so you are limited to the ability to grab those elevations and preparing an Excel table to calculate the overall volume via Stage-Storage. The tool compares each line as if it should calculate to the adjacent one, so in the case of many areas, anything beyond the first area isn't counted in the overall volume.
Matthew Anderson, PE CFM Product Manager Autodesk (Innovyze)
Thanks for your feedback. It is a pity that someone from Autodesk could not have told me that six weeks ago, instead of leaving me thinking that it was being dealt with.
I would have thought however that the ability to show stage storage volumes would have been a real assest to anyone designing ponds or dams which as not rectangular and which may include contours at the same elevation - I am sure this happens a lot!
Our team won't be using the automated stage storage tool going forward. We'll be manually extracting contours, cleaning them up, getting their areas, and then manually entering contour data to define the basin. Basically the same procedure as using Excel.
