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Receiving Different HGL Results when switching from Elev-Area to Elev-Volume Curve in a Pond (CivilStorm)

Good afternoon,

I am working on a combined sewer network routing model.  As part of the model, I have two proposed ponds (forebay and main wetland).  I have found that my maximum HGL results in the ponds are different when I switch from Elevation-Area to Elevation-Volume.  Note that I calculated the elev-volume curve using the elev-area curve and the conic approximation.  

Is it possible that the max HGL difference is due to linear interpolation between increments of the Elev-Volume curve?

The forebay/wetland HGL increases roughly 1.5 ft when switching from Elev-Area to Elev-Volume, so this is not an insignificant issue. 

Thanks,

Seth

Parents
  • Hello Seth,

    Yes, my initial thought is that the difference in results is due to a difference between how you converted to elevation-volume and how CivilStorm performs the conversion. Here is a similar article that refers to the PondPack documentation on the conic method, which should be the same that CivilStorm uses:

    communities.bentley.com/.../147784

    If this does not help, please provide an example pond elevation area curve, your converted elevation-volume curve and details (if possible) on your conversion. If possible, you could also include the model file with the data already entered so we can switch between the pond volume types and confirm. In this case, please include a screenshot of what you're seeing between the two tests, so we can be sure we're seeing the same results. The model files we'll need are the .STSW and .STSW.SQLITE. if you're using an older version of CivilStorm, you'll see a .STSW.MDB instead of the .STSW.SQLITE. Some older versions also consist of a .CSD and .CSD.MDB.

    There are two options for sharing your files on Communities, whichever you choose please be sure to zip your files first. The first option is to attach the zip file containing your model to your reply on the forum using the Advanced Reply Editor (you'll find the link below and to the right of the reply box). If your data is confidential please use the instructions in the link below to send it via Bentley Sharefile. Files uploaded to Sharefile can only be viewed by Bentley employees. Please be sure to reply on this thread with the name of the file after it has been uploaded.

    communities.bentley.com/.../7079.be-communities-secure-file-upload


    Regards,

    Jesse Dringoli
    Technical Support Manager, OpenFlows
    Bentley Communities Site Administrator
    Bentley Systems, Inc.

Reply
  • Hello Seth,

    Yes, my initial thought is that the difference in results is due to a difference between how you converted to elevation-volume and how CivilStorm performs the conversion. Here is a similar article that refers to the PondPack documentation on the conic method, which should be the same that CivilStorm uses:

    communities.bentley.com/.../147784

    If this does not help, please provide an example pond elevation area curve, your converted elevation-volume curve and details (if possible) on your conversion. If possible, you could also include the model file with the data already entered so we can switch between the pond volume types and confirm. In this case, please include a screenshot of what you're seeing between the two tests, so we can be sure we're seeing the same results. The model files we'll need are the .STSW and .STSW.SQLITE. if you're using an older version of CivilStorm, you'll see a .STSW.MDB instead of the .STSW.SQLITE. Some older versions also consist of a .CSD and .CSD.MDB.

    There are two options for sharing your files on Communities, whichever you choose please be sure to zip your files first. The first option is to attach the zip file containing your model to your reply on the forum using the Advanced Reply Editor (you'll find the link below and to the right of the reply box). If your data is confidential please use the instructions in the link below to send it via Bentley Sharefile. Files uploaded to Sharefile can only be viewed by Bentley employees. Please be sure to reply on this thread with the name of the file after it has been uploaded.

    communities.bentley.com/.../7079.be-communities-secure-file-upload


    Regards,

    Jesse Dringoli
    Technical Support Manager, OpenFlows
    Bentley Communities Site Administrator
    Bentley Systems, Inc.

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