• Backwater Analysis vs Capacity Analysis flow profile methods

    Applies To Product(s): SewerGEMS, CivilStorm, StormCAD, SewerCAD Version(s): V8i, CONNECT Edition Area: Calculations Original Author: Mark Pachlhofer, Bentley Technical Support Group Problem…
  • Catchbasin Capturring Efficiency more than 100%

    I am getting at few catchbasins the capturing efficiency is very high (more than 100%), I guess that due to the backflow at the gutter for the certain timestep, would you please assist in the followings; 1- is the backflow is the reason? 2- Why SewerGEMS…
  • Curb Inlet on Grade Efficiency

    I checked SewerGEMS help and found Bentley SWMM is using HEC-22 equation to calculate the inlet efficiency, is that correct? upon reviewing the efficiency calculated by the model for example ( CB-433 ) in the shared model with scenario "5 Year 45 minutes…
  • Failure in SWMM Engine

    I am facing failure during running SewerGEMS model, the notification does not explain the exact problem, it is not specific to enable us to find the problem (as in the below screenshot). The model shared via Bentley secured link, I was trying to run…
  • Fire flow Failed

    Hello, I have run the fire Flow Scenario and I am wonder how some nodes pass the analysis in spite of the pressure (Calculated system lower limit) is negative? please any clarifications?? . Regards...................Mohamad Azzam
  • Flow Capture-In Sag

    I am trying to do flow balance and realized a small discrepancy; The two inlets are In Sag with full capture of the flow of the two catchments as in the screenshot below, I expected to see in the conduit CO-4693 the total flow 29 L/s, the pipe properties…
  • Hydraulic grade discontinuity at steep pipes or across nodes (frontwater analysis)

    Product(s): SewerCAD, StormCAD, CivilStorm, SewerGEMS Version(s): 10.00.xx.xx08.11.xx,xx Area: Calculations Why do I see a jump in the hydraulic grade in the profile? Typically, the StormCAD solver uses a backwater analysis…
  • network is not capturing the full flow from the catchments

    Hi, I have an issue with my Hydraulic Model. I have analysed my model with two different approaches. For Catchbasins I used Full Capture type in Inlet option. Dimensions are 0.6mX0.6m. Used user-defined gutter-> Conventional-> Max Gutter depth…
  • Ponded Area for Modeling Storm Water With Catch Basin

    When create a Storm Water model equipped with catch basins elements and gutters; do we apply "Ponded Area" to the catch basins? Is it usually for the Manholes only or it is recommended to do applying that to the Inlets as well, especially we are creating…
  • Static Head in WaterCAD

    WaterCAD generates nice system head curve if the model has (reservoir -pump - reservoir) configuration. I have other case which common force main; two pumps joining one force main as shown in the screenshot below, the question is: why when one pump is…
  • System Head Curve

    Dear Bentley, I was exploring Example 7 in WaterGems specially System Head Curve and I am curious about how is the model calculate the static Head when you have network (I can figure out if I have forcemain) but when we have network? 1-reservoir…
  • System Head Curve

    Dear All, I am normally used to have parabolic system head curves when the network in question is a single transmission line, which makes sense since the headlosses are a function of V^2/2g. However, I am getting a shape that resembles a third…
  • Troubleshooting unstable SewerGEMS and CivilStorm model results using the Explicit SWMM Solver

    Applies To Product(s): CivilStorm, SewerGEMS Version(s): CONNECT Edition, V8i Area: Layout and Data Input Original Author: Jesse Dringoli, Bentley Technical Support Group Problem When using the Explicit (SWMM…