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Stormcad Results

Dear All;

I am modelling storm water network ( Check Attached Model and screen shots). I have the following question.

1- In screen shot capture-2 spread of water in gutter at the end is 2.3 m while depth (out) is 0.0464 m .... how this happen with road cross slop of 1.5%???. please note that flow at the end of GU-1 equal the sum of  flow bypassed from CB-1 = 5.742 l/sec and flow of catchment area CM-2 = 16.271 l/sec so, total flow at end of this gutter = 22.011 l/sec.

New folder (3).zip

  • Hello Sayed,

    In order to double-check the results from StormCAD, I inputted the catchment and gutter results for CB-1 and GU-1 into Bentley FlowMaster. The overall results, including the spread, seems to be accurate. I would check your input to make sure that it is accurate. Otherwise, please let us know what sort of results you are expecting.

    Regards,
    Scott
  • Hello Scott,
    I need to know what is the relation between spread of 2.3m and 0.0464 m?
    As I understand if the spread is 2.3 m and gutter cross slop is 1.5%, so depth of water should be 0.0345 m not 0.0464m

    Regards
    Sayed
  • The spread and depth results at the catchbasin are measured just upstream of the inlet opening, using the gutter cross section as defined in the catchbasin properties. The catchbasin in question has a Road Cross Slope of 2% (0.02 m/m)

    Depth = Spread * Slope
    Depth = 2.3 m * 0.02
    Depth = 0.046 m

    The 1.5% you mentioned is what you entered in the upstream gutter link element. This is where the "Start" spread of the gutter element is measured from.


    Regards,

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

  •  New folder.zipDear Jesse;

    I do not know why stormcad is allowing us to enter two different gutter cross slops? I think this gutter cross slope shall not be entered in catch basin data and it should be entered in Gutter data only.

    Also after I changed the gutter cross slope to 1.5 % still I have the same problem.

    Depth = Spread * Slope

    Depth = 2.3 m * 0.015

    Depth = 0.0345 m

    Why Program still giving different numbers for depth out ( check attach jpg)

    also, kindly expain what is the beneift of maximum depth gutter in the design (check attached jpg)

    Regards

    Sayed Elhagar

  • Re: "I do not know why stormcad is allowing us to enter two different gutter cross slops?"

    In some cases the shape of the gutter may be different right at the inlet location. See more here:

    Why does the gutter need to be defined in both the catchbasin and gutter element?

    Re: Also after I changed the gutter cross slope to 1.5 % still I have the same problem.

    When you change the cross slope to 1.5% at the catchbasin, you will need to recompute the model as this will have an effect on the depth and spread. When I make this change on my end and recompute the model, the calculation spread is 2.77 m and the calculated depth is 0.0416 m

    Depth = 2.77 m * 0.015

    Depth = 0.0416 m


    Regards,

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

    Answer Verified By: Scott Kampa