Applies To Product(s): Bentley WaterGEMS Version(s): N\A Environment: N\A Area: Other Subarea: N\A Original Author: KATHY WIGGINS, Bentley Technical Support Group Problem User gets error: Microsoft .NET Framework Unhandled exception has occurred in a component in your application. If you click Continue, the application will ignore this error and attempt to continue. Error HRESULT E_FAIL has been returned from a call to a COM component. Solution This framework error can be resolved by an update to the .NET framework 3.5 SP1.
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Wiki Page: Microsoft .NET Framework Error "HRESULT E_FAIL" (Solution 500000075763)
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Wiki Page: How do I measure the 3D length from the start elevation of one pipe to the stop elevation of that pipe
Applies To Product(s): Bentley WaterGEMS, Bentley WaterCAD, Bentley HAMMER Version(s): 08.11.XX.XX Environment: N\A Area: Modeling Subarea: N\A Original Author: Mark Pachlhofer, Bentley Technical Support Group Problem Description I need my pipes to be measured using the 3D length from the start elevation of a pipe to the stop elevation of that pipe. How do I do this? Steps to Resolve Go to Tools > Options > Project Tab. Look for the option toward the bottom of that window that says either, "Calculate Pipe Lengths using node elevations (3D Length)" or "Use 3D Length?".
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Forum Post: RE: gutter and road cross side for SewerGems
You can also see more on inlet/gutter calculations in the Theory section of the help, under "Surface (Gutter) System"
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Wiki Page: How to model a bridge scupper
Applies To Product(s): Bentley CivilStorm, Bentley SewerGEMS, Bentley StormCAD Version(s): 08.11.XX.XX Environment: N/A Area: Modeling Subarea: Original Author: Jesse Dringoli, Bentley Technical Support Group How do I model a bridge scupper with a vertical drain pipe connected to the bottom of a catchbasin, to ensure that it has more capacity than the inlet? Steps to Accomplish Conduits are assumed to be horizontal, so connecting a near-vertical conduit downstream of the catchbasin may not work well. A good option to consider is to estimate this using the orifice or weir equation (Depending on the depth of flow inside the catchbasin vault), using the size of the hole. In the CivilStorm/SewerGEMS/StormCAD model, you can simply connect the catchbasin node directly to an outfall via a short conduit (with the assumption that the inlet opening is the restricting factor and the vertical pipe will have as much or greater capacity to drain the water that the inlet opening captures)
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Forum Post: SewerCAD Terrain Model-Automatic Ground Elevation Update
Hello, I am very new at this website and this is my first question herein. I use SewerCAD Select series 4. In my models, I use terrain models (which is a new feature that makes life much easier in terms of ground elevations-thanks a lot for this) underneath my model. I use .xml surface files for terrain models. But my question is: When I build my model with shapefiles via model builder, even the "update ground elevation from terrain model?" option is "true" (checked), the model does not update the manhole ground elevations. The only way that I have found so far is to select all elements in the drawing and then move them a little bit to the right or left. When I do this, terrain model updates all the manhole ground elevations inside of the terrain model boundary but the original X and Y coordinates of all manholes change. Is there any way to update without moving the elements? Is there any button to update the manhole ground elevations? Thanks in advance
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Forum Post: RE: New diameters in sewercad
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Wiki Page: How can you model transient events in a sewer force main discharging to a manhole? (Solution 500000070765)
Applies To Product(s): Bentley HAMMER Version(s): 08.11.xx.xx Environment: N\A Area: Modeling Subarea: N\A Original Author: Jesse Dringoli, Bentley Technical Support Group Problem How can you model transient events in a sewer force main discharging to a manhole (gravity system)? Solution The main difference in modeling a sewer force main and a potable water system is how to approximate the downstream connection point to the gravity system. The wet well element in the sewer system would be modeled as a tank or reservoir. Everything else is essentially the same as a normal potable water pump model. If the sewer force main is discharging to a manhole that is submerged/surcharged, you may be able to approximate the downstream end of the system using a reservoir, with elevation set to the hydraulic grade in the submerged manhole. If the sewer force main is discharging to a manhole that is not submerged, you should use the Discharge to Atmosphere element. You would need to decide how to compute the headloss through the pipe outlet (the "Pressure Drop (Typical)" field), but a decent estimate might be headloss = k*v^2/2g, where k is set to 1, v is the flow velocity and g is gravity. Alternatively, if the outlet orifice is smaller than the pipe diameter (unlikely) you might want to use the orifice equation, V = C.(2g.headloss)^0.5. Of course these equations are very similar to each other. You can still expect to see some reflection of waves from an discharge/orifice to atmosphere element, because it still takes some time for flows through this orifice to reach a steady state. The reflection is similar to that which occurs in a pipe contraction. If you have high points between the pump station and the downstream gravity main, you may need to utilize the air valve element in order for the pump to 'see' the high point and add enough head to overcome it. See below technote: Modeling Force Mains with Air Valves See Also Modeling Reference - Discharge to Atmosphere
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Forum Post: RE: New diameters in sewercad
Hello ased, Given that the conduits are available for design, make sure that a higher design priority are not being met. You can find information on the design priorities under the Help topic "Design Priorities." If a design priority would be violated by setting a conduit to a certain value, it will not be used. If that doesn't help, we will need a further description of the issue. We may also need to see a copy of the model files. There are two options for sharing your model files on Communities. If you would like the files to be visible to other members, compress the files into a zip file and upload them as an attachment using the ‘Advanced Reply editor’ before posting. If your data is confidential, you can follow the instructions in the link below to send it to us via Bentley Sharefile. Files uploaded to Sharefile can only be viewed by Bentley. communities.bentley.com/.../7079.be-communities-secure-file-upload If you upload the files to Sharefile, please post here with the name of the file as well as the steps to reproduce the issue. Regards, Scott
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Forum Post: RE: New diameters in sewercad
When I input anew diameters like ( 315 mm, 400 mm,500 mm,etc) in the sewercad .. The programm didnt use them in final calculations .. On fiextable results
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Wiki Page: What are the units used for pump inertia, as seen in the Transient Analysis Output Log? (Solution 500000072196)
Applies To Product(s): Bentley HAMMER Version(s): 08.11.xx.xx Environment: N\A Area: Output and Reporting Subarea: N\A Original Author: Jesse Dringoli, Bentley Technical Support Group Problem What are the units used for pump inertia, as seen in the Transient Analysis Output Log? Solution As with other results and output in the text reports, the units are based on the coordinate units of the model. Basically if your model is in SI units, the X/Y coordinates will be in meters, in which case the units will be SI in the text reports. For the case of pump inertia, the units used for SI (meters for coordinate unit) is N-m^2 and the units used for US (feet for coordinate units) are lb-ft^2. So, HAMMER will convert the input values if they are in different units.
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Wiki Page: The check valve on a pipe is not opening... (Solution 500000072356)
Applies To Product(s): Bentley HAMMER Version(s): 08.11.01.32 Environment: N\A Area: Modeling Subarea: N\A Original Author: Scott Kampa, Bentley Technical Support Group Problem The check valve on a pipe is not opening as expected following a pump trip event. Why is this happening? Product: HAMMER V8i Version: 08.11.01.32 Area: , Problem ID#: 47016, PROBLEMSOLVING Solution There are two types of check valves available in modeling: an item in the pipe properties that says "Has check valve?" and a check valve element. If the "has check valve?" one is used and the valve is closed in the initial condition, this element, as well as adjacent elements, is being dropped from the transient analysis. If you have your calculation options set up so that "Generate Extended Output Log" and "Generate Detailed Reports" are set to true, you may see some information the pipe and several other elements are closed and thus removed from the transient analsys. Instead of the setting "Has Check Valve" to true on the pipe, split the pipe with the Check Valve element. Even with this set to Closed, the pipes and adjacent elements will be included in the transient analsys. See Also
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Forum Post: RE: SewerCAD Terrain Model-Automatic Ground Elevation Update
Hello Emre, You might want to look into using TRex (Terrain Extractor). This is the ideal tool for including elevation data for a model. You can find more information on this at the following link: communities.bentley.com/.../8281.trex-terrain-extractor-tool Regards, Scott
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Forum Post: RE: SewerCAD Terrain Model-Automatic Ground Elevation Update
Please take a look at the TRex Terrain Extractor Tool .
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Wiki Page: When computing a model with "Unsteady" s... (Solution 500000072459)
Applies To Product(s): Bentley HAMMER Version(s): 08.11.XX.XX Environment: N\A Area: Modeling Subarea: N\A Original Author: Jesse Dringoli, Bentley Technical Support Group Problem When computing a model with "Unsteady" selected as the transient friction method, unexpected surges or instability occur in the transient results, or the following errors may appear in the user notification window: "Invalid results reached. Please check the input data for the connected elements." Solution In some cases, the unsteady friction method can be very sensitive to the calculation timestep and model configuration. First, consider using a different transient friction method. The "steady" method is more stable and is generally considered more conservative. If you must use the unsteady method, it is highly recommended that you use the "Unsteady - Vitkovsky" method, which is the superior option for unsteady analyses. You can also try adjusting your calculation timestep. Go to Analysis > Transient Timestep options. Check "Use Custom Time Step" and try a larger or smaller timestep. Possible values may lie between 0.001 and 0.1 seconds.
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Forum Post: RE: SewerCAD Terrain Model-Automatic Ground Elevation Update
If you would like, we could also look further into this with your use of Modelbuilder. To do that, it would be good to have a copy of your model. There are two options for sharing your model files on Communities. If you would like the files to be visible to other members, compress the files into a zip file and upload them as an attachment using the ‘Advanced Reply editor’ before posting. If your data is confidential, you can follow the instructions in the link below to send it to us via Bentley Sharefile. Files uploaded to Sharefile can only be viewed by Bentley. communities.bentley.com/.../7079.be-communities-secure-file-upload If you upload the files to Sharefile, please post here with the name of the files so we know they are available. Regards, Scott
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Wiki Page: What does the "Wave Speed Reduction Factor" under Calculation Options do? (Solution 500000072519)
Applies To Product(s): Bentley HAMMER Version(s): 08.11.xx.xx Environment: N\A Area: Modeling Subarea: N\A Original Author: Nancy Mahmoud, Bentley Technical Support Group Problem What does the "Wave Speed Reduction Factor" under Calculation Options do? Solution At low pressures entrained air in a liquid can come out of solution, which can reduce the wave speed. This Wave Speed Reduction Factor field gives some control over the wave speed in the model at low pressures. It is used in conjunction with the "Decrease Time" and "Increase Time" fields. For example, consider entering the following data in the model: a wavespeed of 1000m/s , a Wave Speed Reduction Factor of 0.5, a Decrease Time of 0.2 seconds, and an Increase Time of 3 seconds. In this case, if the liquid pressure reaches vapor pressure, the wave speed in that pipe will start to reduce. Assuming the pressure doesn't increase again in the meantime, the wavespeed will reduce to 500 m/s (1000 m/s x Wave Speed Reduction Factor) linearly over 0.2 seconds (the Decrease Time). While the pressure stays low the wavespeed will stay at 500 m/s, but if the pressure increases the wavespeed will also increase linearly back up to 1000 m/s over 3 seconds (the Increase Time).
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Wiki Page: Initial pressure less than vapor pressure. At the pipe end(s), the elevation(s) or head(s) are incorrect (Solution 500000072593)
Applies To Product(s): Bentley HAMMER Version(s): 08.11.xx.xx Environment: N\A Area: Modeling Subarea: N\A Original Author: Nancy Mahmoud, Bentley Technical Support Group Problem How to resolve the following user notification: "Initial pressure less than vapor pressure. At the pipe end(s), the elevation(s) or head(s) are incorrect". Solution Because of HAMMER's assumption of pressurized pipes, the occurance of sub-vapor pressure in the initial conditions means that you would actually have a vapor pocket at that location, before the transient event even starts. Basically it means the model is not in a true steady state and the model needs to be fixed so that the pressures are correct. The solution to this is different for every model, as there are a number of factors that effect the pressure at a node. Trace the HGL from that node to the upstream boundary condition to get a better idea of why the pressure is that low. In some cases, these negative pressures could occur at a high point where an air valve would actually exist. In such a case, you can set the air valve property "Treat as junction?" to False. and the program will know to have the upstream pump add enough head to overcome the high point. You may still end up with negative pressure downstream of the high point though, which means that the pipe will not be flowing full past the local high point at that flow rate. (It may flow full at other flow rates.) If the pipe is flowing partially full, then you may need to reevaluate your downstream boundary condition. The equations in HAMMER are based on full pipes. Once you get to partly full pipes, you need to change the approach. The dowstream end of the HAMMER model should be the last pipe that is flowing full (crest of the last high point). You could end the system at a reservoir, demand or discharge to atmosphere element.
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Forum Post: RE: New diameters in sewercad
Hello ased, What values are used? There may be cases where design priorities will mean that the conduit size you expect to be used will not be used. You can look at any user notifications you get as well as the results right around the element where this is occurring. The "Design Priorities" Help topic will be useful to see if one of these priorities would be violated if a different conduit size is used. Otherwise, we will likely need a copy of the the model to look into this. You can use the information in my earlier post to send the model to us. Regards, Scott
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Forum Post: RE: New diameters in sewercad
copy of the the model in this link www.4shared.com/.../New_Folder__4_.html
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Wiki Page: No matter what I do I can't get the design run to calculate below the maximum velocity that I have set.
Applies To Product(s): Bentley StormCAD,Bentley SewerCAD, Bentley CivilStorm, Bentley SewerGEMS Version(s): 08.11.03.XX Environment: N/A Area: Output and Reporting Subarea: Original Author: Mark Pachlhofer, Bentley Technical Support Group Problem Description No matter what I do I can't get the design run to calculate below the maximum velocity that I have set. Why is this? Solution The maximum velocity is the very last design constraint in the priorities list and if you think about this makes sense. A higher velocity is really only going to scour your pipes more, which is usually just fine. In order to change the maximum velocity you'd have to change one or more of the other design priorties like the pipe diameter, minimum cover, maximum slope, etc... because you'd be violating the priorities list. In other words, the design tool assumes that the benefit of decreasing velocity does not outweigh the cost of up sizing the pipe or perhaps burying it deeper. If a design priority is violated a user notification alert for the element that violates it will be generated and you might need to make a need an engineering judgment descision on whether this is going to be ok for your project or not. Manual adjustments are expected with the automated design tool because it's really just meant to give the engineer a good starting point for the project design.
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